chore(deps): upgrade integration test dependencies to reduce deprecations

Author: inlined

integration_test/package.json.template

@@ -5,7 +5,7 @@
     "build": "./node_modules/.bin/tsc"
   },
   "dependencies": {
-    "@google-cloud/pubsub": "^2.10.0",
+    "@google-cloud/pubsub": "^4.8.0",
     "firebase-admin": "__FIREBASE_ADMIN__",
     "firebase-functions": "__SDK_TARBALL__"
   },

integration_test/run_tests.sh

@@ -93,7 +93,7 @@ build_sdk
 delete_all_functions
 
 for version in 22 24; do
-  create_package_json $TIMESTAMP $version "^10.0.0"
+  create_package_json "$TIMESTAMP" "$version" "^12.0.0"
   install_deps
   announce "Re-deploying the same functions to Node $version runtime ..."
   deploy