tests: let name resolution fail immediately in test_gui_start_with_bad_server - #124

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: codecov/codecov-action@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/