Bump protobuf-java from 3.18.1 to 3.18.2 in /boms/cloud-lts-bom (#2266)

Bumps [protobuf-java](https://github.com/protocolbuffers/protobuf) from 3.18.1 to 3.18.2.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/master/generate_changelog.py)
- [Commits](protocolbuffers/protobuf@v3.18.1...v3.18.2)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]