ci: activate automerge for github action digest update

Signed-off-by: simonsan <14062932+simonsan@users.noreply.github.com>

Author: simonsan

.github/renovate.json

@@ -6,7 +6,6 @@
     "helpers:pinGitHubActionDigests"
   ],
   "separateMinorPatch": false,
-  "prCreation": "status-success",
   "prHourlyLimit": 1,
   "prConcurrentLimit": 1,
   "major": {