Codex/metal ci xcode - #2

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/setup-python@v5, swift-actions/setup-swift@364295d9c23900ce04d4e5cc708387921b4e50f9. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/