Bump protobuf-java-util from 3.5.1 to 3.6.1 (#486)
Bump protobuf-java-util from 3.5.1 to 3.6.1 (#486)

Bumps [protobuf-java-util](https://github.com/google/protobuf) from 3.5.1 to 3.6.1.
- [Release notes](https://github.com/google/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/master/generate_changelog.py)
- [Commits](https://github.com/google/protobuf/compare/v3.5.1...v3.6.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
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