QA (public)

Seen on https://github.com/os-autoinst/openqa_review/actions/runs/2041575981

The tox invocation started to fail on every Python version but 3.6 with a message tox4: command not found; replacing tox4 with tox will do the opposite and succeeds on every Python version but 3.6 where it fails with tox: command not found. Likely, this is caused by a dependency change as the new (failing) jobs includes tox-3.25.0, the previous (non-failing) used tox-3.24.5.

AC1: The pipeline succeeds on every defined Python version