Update gcloud versions (#243)

Update latest gcloud versions

Author: google-github-actions-bot

data/versions.json

@@ -420,5 +420,6 @@
   "466.0.0",
   "467.0.0",
   "468.0.0",
-  "469.0.0"
+  "469.0.0",
+  "470.0.0"
 ]