Bump protobufVersion in /java-to-rust/java-grpc-example

Bumps `protobufVersion` from 4.29.0 to 4.29.1.

Updates `com.google.protobuf:protobuf-bom` from 4.29.0 to 4.29.1
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](https://github.com/protocolbuffers/protobuf/commits)

Updates `com.google.protobuf:protoc` from 4.29.0 to 4.29.1
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](https://github.com/protocolbuffers/protobuf/commits)

---
updated-dependencies:
- dependency-name: com.google.protobuf:protobuf-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: com.google.protobuf:protoc
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

java-to-rust/java-grpc-example/build.gradle

@@ -8,7 +8,7 @@ buildscript {
         springBootVersion = '3.4.0'
         springDependencyManagementVersion = '1.1.6'
         // https://mvnrepository.com/artifact/com.google.protobuf/protobuf-bom
-        protobufVersion = '4.29.0'
+        protobufVersion = '4.29.1'
         // https://mvnrepository.com/artifact/com.google.protobuf/protobuf-gradle-plugin
         protobufPluginVersion = '0.9.4'
         // https://mvnrepository.com/artifact/io.grpc/grpc-bom