Update gcloud versions (#313)

Update latest gcloud versions

Author: google-github-actions-bot

data/versions.json

@@ -463,5 +463,6 @@
   "508.0.0",
   "509.0.0",
   "510.0.0",
-  "511.0.0"
+  "511.0.0",
+  "512.0.0"
 ]