Bump @types/qs from 6.9.14 to 6.9.15 (#2764)

Bumps [@types/qs](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/qs) from 6.9.14 to 6.9.15.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/qs)

---
updated-dependencies:
- dependency-name: "@types/qs"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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