chore: adjust release merge commit stuff

Author: buehler

.github/workflows/merge-release.yml

@@ -19,5 +19,5 @@ jobs:
           git pull
           git checkout release
           git pull
-          git rebase master
+          git merge master -m "chore: release $(date -u +"%Y-%m-%dT%H:%M:%SZ")"
           git push