Update Functions emulator to fix CI regression (#7089)

Functions/Backend/package.json

@@ -2,8 +2,8 @@
   "name": "functions",
   "description": "Cloud Functions for Firebase",
   "dependencies": {
-    "firebase-admin": "^6.0.0",
-    "firebase-functions": "^2.1.0"
+    "firebase-admin": "^8.0.0",
+    "firebase-functions": "^3.0.0"
   },
   "private": true,
   "devDependencies": {