The source project of this merge request has been removed.
Remove pytest-runner, use pypa build and installer
This removes pytest-runner (to complete the pytest-runner-removal todo task) and also replace deprecated statements (that emit warnings that should be replaced) with: build with python-build, install with python-installer and check with tox (there is a warning that running test manually will be removed at some point).
It also works with Python 3.12. Tested with python3.12 from AUR and libraries installed via pip into venv, without a clean chroot in this particular case.
Also fix license.