Upgrade tests to use PHPUnit 13 - #43

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/upload-artifact@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

No files were found with the provided path: /tmp/horde-ci/lanes/*/ingo/build/*.json /tmp/horde-ci/lanes/*/ingo/build/*.xml. No artifacts will be uploaded.