test(tokenless): stop the late-wake re-list scenario flaking on a loaded host - #3315

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/github-script@v7. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Link an issue with `closes #123`, or add `no-issue: <brief reason>` for a genuinely trivial change.