Bump firebase-admin from 9.6.0 to 9.7.0 in /functions

Bumps [firebase-admin](https://github.com/firebase/firebase-admin-node) from 9.6.0 to 9.7.0.
- [Release notes](https://github.com/firebase/firebase-admin-node/releases)
- [Commits](firebase/firebase-admin-node@v9.6.0...v9.7.0)

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

Author: dependabot[bot]

functions/package-lock.json

@@ -16,7 +16,7 @@
     "@google-cloud/storage": "^5.8.4",
     "child-process-promise": "^2.2.1",
     "express": "^4.17.1",
-    "firebase-admin": "^9.6.0",
+    "firebase-admin": "^9.7.0",
     "firebase-functions": "^3.13.2",
     "md5": "^2.3.0",
     "mkdirp-promise": "^5.0.1",