fix: broken star history chart - #342

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache/restore@v4, actions/cache/save@v4, actions/configure-pages@b8130d9ab958b325bbde9786d62f2c97a9885a0e, actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02, actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/