Bump com.google.protobuf:protoc in /data-prepper-plugins/kafka-plugins

Bumps [com.google.protobuf:protoc](https://github.com/protocolbuffers/protobuf) from 3.25.0 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)

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

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

data-prepper-plugins/kafka-plugins/build.gradle

@@ -101,7 +101,7 @@ dependencies {
 
 protobuf {
     protoc {
-        artifact = 'com.google.protobuf:protoc:3.25.0'
+        artifact = 'com.google.protobuf:protoc:4.29.0'
     }
 }