Bump the java group in /java with 3 updates

Bumps the java group in /java with 3 updates: [com.google.protobuf:protobuf-java](https://github.com/protocolbuffers/protobuf), com.google.protobuf:protobuf-java-util and [io.grpc:grpc-bom](https://github.com/grpc/grpc-java).


Updates `com.google.protobuf:protobuf-java` from 4.28.3 to 4.29.0
- [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:protobuf-java-util` from 4.28.3 to 4.29.0

Updates `com.google.protobuf:protobuf-java-util` from 4.28.3 to 4.29.0

Updates `io.grpc:grpc-bom` from 1.68.1 to 1.68.2
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.68.1...v1.68.2)

---
updated-dependencies:
- dependency-name: com.google.protobuf:protobuf-java
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: java
- dependency-name: com.google.protobuf:protobuf-java-util
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: java
- dependency-name: com.google.protobuf:protobuf-java-util
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: java
- dependency-name: io.grpc:grpc-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: java
...

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

java/pom.xml

@@ -39,12 +39,12 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
         <protoc.version>3.22.2</protoc.version>
-        <google.protobuf.version>4.28.3</google.protobuf.version>
+        <google.protobuf.version>4.29.0</google.protobuf.version>
         <protobuf.maven.plugin.version>0.6.1</protobuf.maven.plugin.version>
 
         <re2j.version>1.7</re2j.version>
         <commons.validator.version>1.9.0</commons.validator.version>
-        <grpc.version>1.68.1</grpc.version>
+        <grpc.version>1.68.2</grpc.version>
         <junit.version>4.13.2</junit.version>
         <assertj.version>3.26.3</assertj.version>
         <java.release>8</java.release>