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 rust-lang/rust#136780 (comment), allow unauthenticated users to relabel `CI-spurious-*`.

Author: jhpratt