Auto merge of #69627 - ehuss:update-cargo-clippy, r=Dylan-DPC

Update cargo, clippy

Closes #69601

## cargo

16 commits in e57bd02999c9f40d52116e0beca7d1dccb0643de..bda50510d1daf6e9c53ad6ccf603da6e0fa8103f
2020-02-21 20:20:10 +0000 to 2020-03-02 18:05:34 +0000
- Fix rare failure in collision_export test. (rust-lang/cargo#7956)
- Ignore broken Cargo.toml in git sources (rust-lang/cargo#7947)
- Add more fingerprint mtime debug logging. (rust-lang/cargo#7952)
- Fix plugin tests for latest nightly. (rust-lang/cargo#7955)
- Simplified usage code of SipHasher (rust-lang/cargo#7945)
- Add a special case for git config discovery inside tests (rust-lang/cargo#7944)
- Fixes issue rust-lang/cargo#7543 (rust-lang/cargo#7946)
- Filter out cfgs which should not be used during build (rust-lang/cargo#7943)
- Provide extra context on a query failure. (rust-lang/cargo#7934)
- Try to clarify `cargo metadata`'s relationship with the workspace. (rust-lang/cargo#7927)
- Update libgit2 dependency (rust-lang/cargo#7939)
- Fix link in comment (rust-lang/cargo#7936)
- Enable `cargo doc --open` tests on macos. (rust-lang/cargo#7932)
- build-std: remove sysroot probe (rust-lang/cargo#7931)
- Try to clarify how feature flags work on the "current" package. (rust-lang/cargo#7928)
- Add extra details in the new feature resolver doc comment. (rust-lang/cargo#7918)

## clippy

6 commits in fc5d0cc..8b7f7e6
2020-02-24 05:58:17 +0000 to 2020-03-02 20:00:31 +0000
- Rustup to #69469 (rust-lang/rust-clippy#5254)
- Some rustups (rust-lang/rust-clippy#5247)
- Update git2 to 0.12 (rust-lang/rust-clippy#5232)
- Rustup to #61812 (rust-lang/rust-clippy#5231)
- Add lint to improve floating-point expressions (rust-lang/rust-clippy#4897)
- Do not run deploy action on other repos (rust-lang/rust-clippy#5222)

Cargo.lock

@@ -1254,9 +1254,9 @@ dependencies = [
 
 [[package]]
 name = "git2"
-version = "0.11.0"
+version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "77519ef7c5beee314d0804d4534f01e0f9e8d9acdee2b7a48627e590b27e0ec4"
+checksum = "26e07ef27260a78f7e8d218ebac2c72f2c4db50493741b190b6e8eade1da7c68"
 dependencies = [
  "bitflags",
  "libc",
@@ -1269,9 +1269,9 @@ dependencies = [
 
 [[package]]
 name = "git2-curl"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d2559abb1d87d27668d31bd868a000f0e2e0065d10e78961b62da95d7a7f1cc7"
+checksum = "af1754ec4170e7dcaf9bb43743bb16eddb8d827b2e0291deb6f220a6e16fe46a"
 dependencies = [
  "curl",
  "git2",
@@ -1789,9 +1789,9 @@ dependencies = [
 
 [[package]]
 name = "libgit2-sys"
-version = "0.10.0"
+version = "0.11.0+0.99.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d9ec6bca50549d34a392611dde775123086acbd994e3fff64954777ce2dc2e51"
+checksum = "4d5d1459353d397a029fb18862166338de938e6be976606bd056cf8f1a912ecf"
 dependencies = [
  "cc",
  "libc",