GenerateJLHeader.jl: add missing packages to a temporary environment - #35

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-java@v4, actions/upload-artifact@v4, julia-actions/setup-julia@v2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

[msystem-mingw64] MINGW64 is deprecated. Migrate to UCRT64 or CLANG64. To acknowledge and suppress this warning, add 'msystem-mingw64' to 'suppress-deprecation-warnings'.

setup-java v4 is deprecated and will no longer receive updates. Please migrate to actions/setup-java@v5.