[M1-SYS-02] Fix Windows CI: MSVC C4267/C4127 fatal under /WX - #26

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. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/