actionlint accepts four macos-X.0 (X is one of 11, 12, 13, 14) runner labels, but none of them are found in the list of labels for GitHub-hosted runner images.

Among them macos-11.0 once existed (see actions/runner-images#1814), is deprecated now and PR #451 proposed its removal. But I doubt whether other maxos-X.0 labels ever existed.

I tested using runs-on: macos-14.0 in muzimuzhi/hello-github-actions@c5f0e6a, and the job hanged at "Waiting for a runner to pick up this job...", quite the case when an invalid runner label was used.