Make numexpr work under Pyodide/WebAssembly - #585

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v3, actions/setup-python@v3, actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

cibuildwheel: Invalid skip selector: 'cp313t-*'. cibuildwheel 4.x no longer supports Python 3.13 free-threading. Please use the 3.x series or update `skip`. This selector will have no effect.