releng: build with target e4.42 by default - #437

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, coactions/setup-xvfb@b6b4fcfb9f5a895edadc3bc76318fae0ac17c8b3, stCarolas/setup-maven@07fbbe97d97ef44336b7382563d66743297e442f. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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