Shorten no merge conflict message

Signed-off-by: Christian König <ckoenig@posteo.de>

.github/workflows/merge-conflict.yml

@@ -18,4 +18,4 @@ jobs:
           dirtyLabel: "PR: Merge Conflict"
           repoToken: "${{ secrets.GITHUB_TOKEN }}"
           commentOnDirty: "This pull request has conflicts, please resolve those before we can evaluate the pull request."
-          commentOnClean: "Conflicts have been resolved. A maintainer will review the pull request shortly."
+          commentOnClean: "Conflicts have been resolved."