Used patched tower that avoids balancer panic

tower-rs/tower#668 fixes a bug that can cause the load balancer to fail
to properly observe cancelations when an endpoint is replaced or
removed.

This change updates the proxy to use tower from a fixed git SHA.

Signed-off-by: Oliver Gould <ver@buoyant.io>

Cargo.lock

@@ -40,9 +40,9 @@ checksum = "08f9b8508dccb7687a1d6c4ce66b2b0ecef467c94667de27d8d7fe1f8d2a9cdc"
 
 [[package]]
 name = "arbitrary"
-version = "1.1.0"
+version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c38b6b6b79f671c25e1a3e785b7b82d7562ffc9cd3efdc98627e5668a2472490"
+checksum = "25e0a02cf12f1b1f48b14cb7f8217b876d09992b39c816ffb3b1ba64dd979a87"
 dependencies = [
  "derive_arbitrary",
 ]
@@ -169,7 +169,7 @@ version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6fac387a98bb7c37292057cffc56d62ecb629900026402633ae9160df93a8766"
 dependencies = [
- "nom 7.1.0",
+ "nom 7.1.1",
 ]
 
 [[package]]
@@ -225,9 +225,9 @@ dependencies = [
 
 [[package]]
 name = "derive_arbitrary"
-version = "1.1.0"
+version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "98e23c06c035dac87bd802d98f368df73a7f2cb05a66ffbd1f377e821fac4af9"
+checksum = "8728db27dd9033a7456655aaeb35fde74425d0f130b4cb18a19171ef38a1b454"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -415,13 +415,13 @@ dependencies = [
 
 [[package]]
 name = "getrandom"
-version = "0.2.6"
+version = "0.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9be70c98951c83b8d2f8f60d7065fa6d5146873094452a1008da8c2f1e4205ad"
+checksum = "4eb1a864a501629691edf6c15a593b7a51eebaa1e8468e9ddc623de7c9b58ec6"
 dependencies = [
  "cfg-if",
  "libc",
- "wasi 0.10.2+wasi-snapshot-preview1",
+ "wasi",
 ]
 
 [[package]]
@@ -460,9 +460,9 @@ dependencies = [
 
 [[package]]
 name = "hashbrown"
-version = "0.11.2"
+version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ab5ef0d4909ef3724cc8cce6ccc8572c5c817592e9285f5464f8e86f8bd3726e"
+checksum = "db0d4cf898abf0081f964436dc980e96670a0f36863e4b83aaacdb65c9d7ccc3"
 
 [[package]]
 name = "hdrhistogram"
@@ -596,9 +596,9 @@ dependencies = [
 
 [[package]]
 name = "indexmap"
-version = "1.8.2"
+version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e6012d540c5baa3589337a98ce73408de9b5a25ec9fc2c6fd6be8f0d39e0ca5a"
+checksum = "6c6392766afd7964e2531940894cffe4bd8d7d17dbc3c1c4857040fd4b33bdb3"
 dependencies = [
  "autocfg",
  "hashbrown",
@@ -669,9 +669,9 @@ dependencies = [
 
 [[package]]
 name = "js-sys"
-version = "0.3.57"
+version = "0.3.58"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "671a26f820db17c2a2750743f1dd03bafd15b98c9f30c7c2628c024c05d73397"
+checksum = "c3fac17f7123a73ca62df411b1bf727ccc805daa070338fda671c86dac1bdc27"
 dependencies = [
  "wasm-bindgen",
 ]
@@ -1773,7 +1773,7 @@ checksum = "713d550d9b44d89174e066b7a6217ae06234c10cb47819a88290d2b353c31799"
 dependencies = [
  "libc",
  "log",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "windows-sys",
 ]
 
@@ -1791,13 +1791,12 @@ checksum = "cf51a729ecf40266a2368ad335a5fdde43471f545a967109cd62146ecf8b66ff"
 
 [[package]]
 name = "nom"
-version = "7.1.0"
+version = "7.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b1d11e1ef389c76fe5b81bcaf2ea32cf88b62bc494e19f493d0b30e7a930109"
+checksum = "a8903e5a29a317527874d0402f867152a3d21c908bb0b933e416c65e301d4c36"
 dependencies = [
  "memchr",
  "minimal-lexical",
- "version_check",
 ]
 
 [[package]]
@@ -1921,9 +1920,9 @@ checksum = "eb9f9e6e233e5c4a35559a617bf40a4ec447db2e84c20b55a6f83167b7e57872"
 
 [[package]]
 name = "prettyplease"
-version = "0.1.11"
+version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f28f53e8b192565862cf99343194579a022eb9c7dd3a8d03134734803c7b3125"
+checksum = "e5355b9d4fc0cc607db0c2e93c7a035a32226bfa770e0c6fec504f0018015bad"
 dependencies = [
  "proc-macro2",
  "syn",
@@ -1984,9 +1983,9 @@ dependencies = [
 
 [[package]]
 name = "prost-derive"
-version = "0.10.0"
+version = "0.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "df35198f0777b75e9ff669737c6da5136b59dba33cf5a010a6d1cc4d56defc6f"
+checksum = "7b670f45da57fb8542ebdbb6105a925fe571b67f9e7ed9f47a06a84e72b4e7cc"
 dependencies = [
  "anyhow",
  "itertools",
@@ -1997,9 +1996,9 @@ dependencies = [
 
 [[package]]
 name = "prost-types"
-version = "0.10.0"
+version = "0.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "926681c118ae6e512a3ccefd4abbe5521a14f4cc1e207356d4d00c0b7f2006fd"
+checksum = "2d0a014229361011dc8e69c8a1ec6c2e8d0f2af7c91e3ea3f5b2170298461e68"
 dependencies = [
  "bytes",
  "prost",
@@ -2482,8 +2481,7 @@ dependencies = [
 [[package]]
 name = "tower"
 version = "0.4.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9a89fd63ad6adf737582df5db40d286574513c69a11dac5214dc3b5603d6713e"
+source = "git+https://github.com/tower-rs/tower?rev=dbad721b30fcbeb8339068e8bc10c20b3af97a6f#dbad721b30fcbeb8339068e8bc10c20b3af97a6f"
 dependencies = [
  "futures-core",
  "futures-util",
@@ -2502,23 +2500,20 @@ dependencies = [
 [[package]]
 name = "tower-layer"
 version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "343bc9466d3fe6b0f960ef45960509f84480bf4fd96f92901afe7ff3df9d3a62"
+source = "git+https://github.com/tower-rs/tower?rev=dbad721b30fcbeb8339068e8bc10c20b3af97a6f#dbad721b30fcbeb8339068e8bc10c20b3af97a6f"
 
 [[package]]
 name = "tower-service"
 version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "360dfd1d6d30e05fda32ace2c8c70e9c0a9da713275777f5a4dbb8a1893930c6"
+source = "git+https://github.com/tower-rs/tower?rev=dbad721b30fcbeb8339068e8bc10c20b3af97a6f#dbad721b30fcbeb8339068e8bc10c20b3af97a6f"
 
 [[package]]
 name = "tower-test"
 version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a4546773ffeab9e4ea02b8872faa49bb616a80a7da66afc2f32688943f97efa7"
+source = "git+https://github.com/tower-rs/tower?rev=dbad721b30fcbeb8339068e8bc10c20b3af97a6f#dbad721b30fcbeb8339068e8bc10c20b3af97a6f"
 dependencies = [
  "futures-util",
- "pin-project",
+ "pin-project-lite",
  "tokio",
  "tokio-test",
  "tower-layer",
@@ -2540,9 +2535,9 @@ dependencies = [
 
 [[package]]
 name = "tracing-attributes"
-version = "0.1.20"
+version = "0.1.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2e65ce065b4b5c53e73bb28912318cb8c9e9ad3921f1d669eb0e68b4c8143a2b"
+checksum = "cc6b8ad3567499f98a1db7a752b07a7c8c7c7c34c332ec00effb2b0027974b7c"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -2604,9 +2599,9 @@ dependencies = [
 
 [[package]]
 name = "trust-dns-proto"
-version = "0.21.1"
+version = "0.21.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2861b3ed517888174d13909e675c4e94b3291867512068be59d76533e4d1270c"
+checksum = "9c31f240f59877c3d4bb3b3ea0ec5a6a0cff07323580ff8c7a605cd7d08b255d"
 dependencies = [
  "async-trait",
  "cfg-if",
@@ -2661,9 +2656,9 @@ checksum = "099b7128301d285f79ddd55b9a83d5e6b9e97c92e0ea0daebee7263e932de992"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.0"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d22af068fba1eb5edcb4aea19d382b2a3deb4c8f9d475c589b6ada9e0fd493ee"
+checksum = "5bd2fe26506023ed7b5e1e315add59d6f584c621d037f9368fea9cfb988f368c"
 
 [[package]]
 name = "unicode-normalization"
@@ -2698,12 +2693,6 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "830b7e5d4d90034032940e4ace0d9a9a057e7a45cd94e6c007832e39edb82f6d"
 
-[[package]]
-name = "version_check"
-version = "0.9.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
-
 [[package]]
 name = "want"
 version = "0.3.0"
@@ -2714,12 +2703,6 @@ dependencies = [
  "try-lock",
 ]
 
-[[package]]
-name = "wasi"
-version = "0.10.2+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -2728,19 +2711,19 @@ checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
 
 [[package]]
 name = "wasm-bindgen"
-version = "0.2.80"
+version = "0.2.81"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "27370197c907c55e3f1a9fbe26f44e937fe6451368324e009cba39e139dc08ad"
+checksum = "7c53b543413a17a202f4be280a7e5c62a1c69345f5de525ee64f8cfdbc954994"
 dependencies = [
  "cfg-if",
  "wasm-bindgen-macro",
 ]
 
 [[package]]
 name = "wasm-bindgen-backend"
-version = "0.2.80"
+version = "0.2.81"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "53e04185bfa3a779273da532f5025e33398409573f348985af9a1cbf3774d3f4"
+checksum = "5491a68ab4500fa6b4d726bd67408630c3dbe9c4fe7bda16d5c82a1fd8c7340a"
 dependencies = [
  "bumpalo",
  "lazy_static",
@@ -2753,19 +2736,19 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro"
-version = "0.2.80"
+version = "0.2.81"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "17cae7ff784d7e83a2fe7611cfe766ecf034111b49deb850a3dc7699c08251f5"
+checksum = "c441e177922bc58f1e12c022624b6216378e5febc2f0533e41ba443d505b80aa"
 dependencies = [
  "quote",
  "wasm-bindgen-macro-support",
 ]
 
 [[package]]
 name = "wasm-bindgen-macro-support"
-version = "0.2.80"
+version = "0.2.81"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "99ec0dc7a4756fffc231aab1b9f2f578d23cd391390ab27f952ae0c9b3ece20b"
+checksum = "7d94ac45fcf608c1f45ef53e748d35660f168490c10b23704c7779ab8f5c3048"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -2776,15 +2759,15 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-shared"
-version = "0.2.80"
+version = "0.2.81"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d554b7f530dee5964d9a9468d95c1f8b8acae4f282807e7d27d4b03099a46744"
+checksum = "6a89911bd99e5f3659ec4acf9c4d93b0a90fe4a2a11f15328472058edc5261be"
 
 [[package]]
 name = "web-sys"
-version = "0.3.57"
+version = "0.3.58"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b17e741662c70c8bd24ac5c5b18de314a2c26c32bf8346ee1e6f53de919c283"
+checksum = "2fed94beee57daf8dd7d51f2b15dc2bcde92d7a72304cdf662a4371008b71b90"
 dependencies = [
  "js-sys",
  "wasm-bindgen",