Update gcloud versions (#312)

Update latest gcloud versions

Author: google-github-actions-bot

data/versions.json

@@ -462,5 +462,6 @@
   "507.0.0",
   "508.0.0",
   "509.0.0",
-  "510.0.0"
+  "510.0.0",
+  "511.0.0"
 ]