Bump qs, express and firebase-tools

Bumps [qs](https://github.com/ljharb/qs) to 6.14.2 and updates ancestor dependencies [qs](https://github.com/ljharb/qs), [express](https://github.com/expressjs/express) and [firebase-tools](https://github.com/firebase/firebase-tools). These dependencies need to be updated together.


Updates `qs` from 6.13.0 to 6.14.2
- [Changelog](https://github.com/ljharb/qs/blob/main/CHANGELOG.md)
- [Commits](ljharb/qs@v6.13.0...v6.14.2)

Updates `express` from 4.21.2 to 4.22.1
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/v4.22.1/History.md)
- [Commits](expressjs/express@4.21.2...v4.22.1)

Updates `firebase-tools` from 8.20.0 to 15.6.0
- [Release notes](https://github.com/firebase/firebase-tools/releases)
- [Commits](firebase/firebase-tools@v8.20.0...v15.6.0)

---
updated-dependencies:
- dependency-name: qs
  dependency-version: 6.14.2
  dependency-type: indirect
- dependency-name: express
  dependency-version: 4.22.1
  dependency-type: indirect
- dependency-name: firebase-tools
  dependency-version: 15.6.0
  dependency-type: direct:development
...

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Author: dependabot[bot]