Bump protobuf from 3.15.6 to 3.15.8 (#728)
Bump protobuf from 3.15.6 to 3.15.8 (#728)

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 3.15.6 to 3.15.8.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/master/generate_changelog.py)
- [Commits](https://github.com/protocolbuffers/protobuf/compare/v3.15.6...v3.15.8)

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

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
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