Bump protobuf from 3.12.0 to 3.12.1 in /requirements
Bump protobuf from 3.12.0 to 3.12.1 in /requirements

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 3.12.0 to 3.12.1.
- [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/v3.12.0...v3.12.1)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
diox/olympia,wagnerand/addons-server,diox/olympia,mozilla/olympia,eviljeff/olympia,mozilla/addons-server,mozilla/olympia,bqbn/addons-server,wagnerand/addons-server,eviljeff/olympia,bqbn/addons-server,mozilla/addons-server,mozilla/addons-server,wagnerand/addons-server,diox/olympia,eviljeff/olympia,bqbn/addons-server,bqbn/addons-server,diox/olympia,wagnerand/addons-server,mozilla/olympia,eviljeff/olympia,mozilla/addons-server,mozilla/olympia