Bump tar and firebase-tools in /functions

Bumps [tar](https://github.com/isaacs/node-tar) to 6.2.1 and updates ancestor dependency [firebase-tools](https://github.com/firebase/firebase-tools). These dependencies need to be updated together.


Updates `tar` from 6.1.11 to 6.2.1
- [Release notes](https://github.com/isaacs/node-tar/releases)
- [Changelog](https://github.com/isaacs/node-tar/blob/main/CHANGELOG.md)
- [Commits](isaacs/node-tar@v6.1.11...v6.2.1)

Updates `firebase-tools` from 9.10.0 to 13.7.1
- [Release notes](https://github.com/firebase/firebase-tools/releases)
- [Commits](firebase/firebase-tools@v9.10.0...v13.7.1)

---
updated-dependencies:
- dependency-name: tar
  dependency-type: indirect
- dependency-name: firebase-tools
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>