Update gcloud versions (#311)

Update latest gcloud versions

Author: google-github-actions-bot

data/versions.json

@@ -461,5 +461,6 @@
   "506.0.0",
   "507.0.0",
   "508.0.0",
-  "509.0.0"
+  "509.0.0",
+  "510.0.0"
 ]