fix(deps): update dependency @google-cloud/pubsub to ^0.26.0 (#618)

Author: renovate[bot]

handwritten/storage/package.json

@@ -72,7 +72,7 @@
   },
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.0.0",
-    "@google-cloud/pubsub": "^0.25.0",
+    "@google-cloud/pubsub": "^0.26.0",
     "@types/arrify": "^1.0.4",
     "@types/async": "^2.0.49",
     "@types/compressible": "^2.0.0",