deps: bump firebase-functions

Bumps the safe-function-dependencies group with 1 update in the /functions directory: [firebase-functions](https://github.com/firebase/firebase-functions).


Updates `firebase-functions` from 6.1.0 to 6.1.1
- [Release notes](https://github.com/firebase/firebase-functions/releases)
- [Changelog](https://github.com/firebase/firebase-functions/blob/master/tsconfig.release.json)
- [Commits](firebase/firebase-functions@v6.1.0...v6.1.1)

---
updated-dependencies:
- dependency-name: firebase-functions
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: safe-function-dependencies
...

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