🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Author: gcf-owl-bot[bot]

release-please-config.json

@@ -315,6 +315,7 @@
     "src/apis/appengine": {},
     "src/apis/dlp": {},
     "src/apis/css": {},
-    "src/apis/policysimulator": {}
+    "src/apis/policysimulator": {},
+    "src/apis/apigateway": {}
   }
-}
+}