Unrolled build for rust-lang#119938

Rollup merge of rust-lang#119938 - Nilstrieb:has-merge-commits-unauthenticated, r=fmease

Allow unauthorized users to user the has-merge-commits label

So they can remove it after they've removed the merge commit.

triagebot.toml

@@ -22,6 +22,7 @@ allow-unauthenticated = [
     "perf-*",
     "AsyncAwait-OnDeck",
     "needs-triage",
+    "has-merge-commits",
 ]
 
 [review-submitted]