Rollup merge of #138184 - thaliaarchi:unauthenticated-ci-spurious, r=compiler-errors

Allow anyone to relabel `CI-spurious-*`

As suggested by `@Noratrieb` in reference to me attempting to set this label in #136780 (comment), allow unauthenticated users to relabel `CI-spurious-*`.

Author: jhpratt

triagebot.toml

@@ -18,6 +18,7 @@ allow-unauthenticated = [
     "WG-*",
     "-Z*",
     "beta-nominated",
+    "CI-spurious-*",
     "const-hack",
     "llvm-*",
     "needs-fcp",