clean pipeline - #12

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@4d4ae6ae148a43d0fd1eda1800170683e9882738, actions/checkout@v4, julia-actions/setup-julia@v2, pyTooling/Actions/with-post-step@adef08d3bdef092282614f3b683897cefae82ee3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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