build(deps): bump tonic-build from 0.8.4 to 0.9.1

Bumps [tonic-build](https://github.com/hyperium/tonic) from 0.8.4 to 0.9.1.
- [Release notes](https://github.com/hyperium/tonic/releases)
- [Changelog](https://github.com/hyperium/tonic/blob/master/CHANGELOG.md)
- [Commits](hyperium/tonic@v0.8.4...v0.9.1)

---
updated-dependencies:
- dependency-name: tonic-build
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.lock

@@ -4745,9 +4745,9 @@ dependencies = [
 
 [[package]]
 name = "tonic-build"
-version = "0.8.4"
+version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5bf5e9b9c0f7e0a7c027dcfaba7b2c60816c7049171f679d99ee2ff65d0de8c4"
+checksum = "0f60a933bbea70c95d633c04c951197ddf084958abaa2ed502a3743bdd8d8dd7"
 dependencies = [
  "prettyplease",
  "proc-macro2 1.0.53",

zebrad/Cargo.toml

@@ -171,7 +171,7 @@ console-subscriber = { version = "0.1.8", optional = true }
 vergen = { version = "7.5.1", default-features = false, features = ["cargo", "git"] }
 
 # test feature lightwalletd-grpc-tests
-tonic-build = { version = "0.8.0", optional = true }
+tonic-build = { version = "0.9.1", optional = true }
 
 [dev-dependencies]
 abscissa_core = { version = "0.5", features = ["testing"] }