Bump grpcVersion from 1.39.0 to 1.55.1

Bumps `grpcVersion` from 1.39.0 to 1.55.1.

Updates `io.grpc:grpc-protobuf` from 1.39.0 to 1.55.1
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.39.0...v1.55.1)

Updates `io.grpc:grpc-stub` from 1.39.0 to 1.55.1
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.39.0...v1.55.1)

Updates `io.grpc:grpc-netty-shaded` from 1.39.0 to 1.55.1
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.39.0...v1.55.1)

---
updated-dependencies:
- dependency-name: io.grpc:grpc-protobuf
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: io.grpc:grpc-stub
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: io.grpc:grpc-netty-shaded
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle

@@ -77,7 +77,7 @@ java {
 // All it does is complain about generated code.
 javadoc { options.addStringOption('Xdoclint:none', '-quiet') }
 
-def grpcVersion = "1.39.0"
+def grpcVersion = "1.55.1"
 def protocVersion = "3.17.3"
 def authzedProtoCommit = "125e39e67bf60b2d19c4de15aaa69cb1bcbda28c"
 def bufDir = "${buildDir}/buf"