Bump protobuf-java in /bundles/org.openhab.voice.googlestt (#13491)

Bump protobuf-java in /bundles/org.openhab.voice.googlestt (#13491)

Bumps [protobuf-java](https://github.com/protocolbuffers/protobuf) from 3.19.2 to 3.19.6.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](https://github.com/protocolbuffers/protobuf/compare/v3.19.2...v3.19.6)

---
updated-dependencies:
- dependency-name: com.google.protobuf:protobuf-java
  dependency-type: direct:production
...

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