fix(deps): update dependency @google-cloud/pubsub to ^0.29.0 (#714)

Author: renovate[bot]

handwritten/storage/package.json

@@ -71,7 +71,7 @@
     "xdg-basedir": "^4.0.0"
   },
   "devDependencies": {
-    "@google-cloud/pubsub": "^0.28.0",
+    "@google-cloud/pubsub": "^0.29.0",
     "@types/async": "^2.0.49",
     "@types/compressible": "^2.0.0",
     "@types/concat-stream": "^1.6.0",