chore(deps): bump qs and firebase-functions in /functions (#803)

Bumps [qs](https://github.com/ljharb/qs) to 6.16.0 and updates ancestor dependency [firebase-functions](https://github.com/firebase/firebase-functions). These dependencies need to be updated together.


Updates `qs` from 6.15.3 to 6.16.0
- [Changelog](https://github.com/ljharb/qs/blob/main/CHANGELOG.md)
- [Commits](ljharb/qs@v6.15.3...v6.16.0)

Updates `firebase-functions` from 7.2.5 to 7.3.2
- [Release notes](https://github.com/firebase/firebase-functions/releases)
- [Commits](firebase/firebase-functions@v7.2.5...v7.3.2)

---
updated-dependencies:
- dependency-name: qs
  dependency-version: 6.16.0
  dependency-type: indirect
- dependency-name: firebase-functions
  dependency-version: 7.3.2
  dependency-type: direct:production
...

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Author: dependabot[bot]