fix(deps): update dependency @google-cloud/storage to v6 (#335)

Author: renovate-bot

document-ai/package.json

@@ -14,7 +14,7 @@
   },
   "dependencies": {
     "@google-cloud/documentai": "^3.3.0",
-    "@google-cloud/storage": "^5.0.0",
+    "@google-cloud/storage": "^6.0.0",
     "p-queue": "^6.6.2",
     "uuid": "^8.3.1"
   },