Bump grpc-tools from 1.57.0 to 1.59.2

Bumps [grpc-tools](https://github.com/google/grpc) from 1.57.0 to 1.59.2.
- [Release notes](https://github.com/google/grpc/releases)
- [Changelog](https://github.com/grpc/grpc/blob/master/src/ruby/CHANGELOG.md)
- [Commits](grpc/grpc@v1.57.0...v1.59.2)

---
updated-dependencies:
- dependency-name: grpc-tools
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -15,7 +15,7 @@ GEM
     grpc (1.59.2)
       google-protobuf (~> 3.24)
       googleapis-common-protos-types (~> 1.0)
-    grpc-tools (1.57.0)
+    grpc-tools (1.59.2)
     rake (13.1.0)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)