fix(deps): update dependency googleapis to v51 (#339)

Author: renovate-bot

packages/google-cloud-iot/samples/package.json

@@ -17,7 +17,7 @@
   "dependencies": {
     "@google-cloud/iot": "^2.0.0",
     "@google-cloud/pubsub": "^1.6.0",
-    "googleapis": "^50.0.0",
+    "googleapis": "^51.0.0",
     "util.promisify": "^1.0.1"
   },
   "devDependencies": {