Bump Google.Protobuf from 3.11.2 to 3.11.4 (#4225)
Bump Google.Protobuf from 3.11.2 to 3.11.4 (#4225)

Bumps [Google.Protobuf](https://github.com/protocolbuffers/protobuf) from 3.11.2 to 3.11.4.
- [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/v3.11.2...v3.11.4)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
simonlaroche/akka.net,simonlaroche/akka.net