fix(deps): update dependency firebase-admin to ^12.7.0

Author: renovate[bot]

functions/package-lock.json

@@ -16,7 +16,7 @@
     "@google-cloud/firestore": "^7.11.6",
     "cors": "^2.8.6",
     "express": "^4.22.1",
-    "firebase-admin": "^12.0.0",
+    "firebase-admin": "^12.7.0",
     "firebase-functions": "^5.0.0"
   },
   "private": true