Bump firebase from 9.23.0 to 12.6.0

Bumps [firebase](https://github.com/firebase/firebase-js-sdk) from 9.23.0 to 12.6.0.
- [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@9.23.0...firebase@12.6.0)

---
updated-dependencies:
- dependency-name: firebase
  dependency-version: 12.6.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]