Update gcloud versions (#310)

Update latest gcloud versions

Author: google-github-actions-bot

data/versions.json

@@ -460,5 +460,6 @@
   "505.0.0",
   "506.0.0",
   "507.0.0",
-  "508.0.0"
+  "508.0.0",
+  "509.0.0"
 ]