chore(deps): bump qs from 6.15.3 to 6.16.0 in /backend (#242)

Bumps [qs](https://github.com/ljharb/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)

---
updated-dependencies:
- dependency-name: qs
  dependency-version: 6.16.0
  dependency-type: indirect
...

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