Bump protobufjs and firebase in /frontend

Bumps [protobufjs](https://github.com/protobufjs/protobuf.js) to 7.5.5 and updates ancestor dependency [firebase](https://github.com/firebase/firebase-js-sdk). These dependencies need to be updated together.


Updates `protobufjs` from 6.11.3 to 7.5.5
- [Release notes](https://github.com/protobufjs/protobuf.js/releases)
- [Changelog](https://github.com/protobufjs/protobuf.js/blob/master/CHANGELOG.md)
- [Commits](protobufjs/protobuf.js@v6.11.3...protobufjs-v7.5.5)

Updates `firebase` from 9.6.6 to 12.12.0
- [Release notes](https://github.com/firebase/firebase-js-sdk/releases)
- [Changelog](https://github.com/firebase/firebase-js-sdk/blob/main/CHANGELOG.md)
- [Commits](https://github.com/firebase/firebase-js-sdk/compare/firebase@9.6.6...firebase@12.12.0)

---
updated-dependencies:
- dependency-name: protobufjs
  dependency-version: 7.5.5
  dependency-type: indirect
- dependency-name: firebase
  dependency-version: 12.12.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]