Bump tonic-build from 0.12.0 to 0.12.1 in /rustclient/lib (#233)

Bumps [tonic-build](https://github.com/hyperium/tonic) from 0.12.0 to 0.12.1.
- [Release notes](https://github.com/hyperium/tonic/releases)
- [Changelog](https://github.com/hyperium/tonic/blob/master/CHANGELOG.md)
- [Commits](hyperium/tonic@v0.12.0...v0.12.1)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

rustclient/lib/Cargo.toml

@@ -16,4 +16,4 @@ futures = "0.3.30"
 async-stream = "0.3.5"
 
 [build-dependencies]
-tonic-build = "0.12.0"
+tonic-build = "0.12.1"