ci: enable automerge for renovate

Author: ChrisKujawa

renovate.json

@@ -2,5 +2,9 @@
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": [
     "config:recommended"
-  ]
+  ],
+  "lockFileMaintenance": {
+    "enabled": true,
+    "automerge": true
+  }
 }