Build failed: Error: The process '/usr/bin/xvfb-run' failed with exit code 1

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3, twelho/cache@conditional, crazy-max/ghaction-import-gpg@v5, twelho/flatpak-github-actions/flatpak-builder@local-repo-path. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.