chore(deps): update dependency @google-cloud/functions to v3 (#613)

Author: renovate-bot

background/package.json

@@ -22,7 +22,7 @@
   "devDependencies": {
     "body-parser": "^1.18.3",
     "child_process": "^1.0.2",
-    "@google-cloud/functions": "^2.0.0",
+    "@google-cloud/functions": "^3.0.0",
     "mocha": "^9.0.0",
     "node-fetch": "^2.6.0",
     "uuid": "^9.0.0",