Update release-config.json

The release creation is now failing as the version of googleapis/release-please-action has been update.

Author: mrudatsprint

.github/release-config.json

@@ -10,7 +10,7 @@
   ],
   "packages": {
     ".": {
-      "release-type": "generic"
+      "release-type": "simple"
     }
   }
 }