chore(deps): update dependency @google-cloud/pubsub to v0.22.2

Author: renovate[bot]

iot/beta-features/gateway/package.json

@@ -24,7 +24,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.0.0",
     "ava": "0.25.0",
-    "@google-cloud/pubsub": "0.13.2",
+    "@google-cloud/pubsub": "0.22.2",
     "uuid": "3.1.0"
   },
   "cloud-repo-tools": {