Bump firebase from 7.15.1 to 8.2.1

Bumps [firebase](https://github.com/firebase/firebase-js-sdk) from 7.15.1 to 8.2.1.
- [Release notes](https://github.com/firebase/firebase-js-sdk/releases)
- [Changelog](https://github.com/firebase/firebase-js-sdk/blob/master/CHANGELOG.md)
- [Commits](https://github.com/firebase/firebase-js-sdk/commits)

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

Author: dependabot-preview[bot]