[FEATURE] PyTest Pippel on new Pip release

[arifer612]

This is part of the goal to fully automate the checks to keep Pippel up to date
with the latest pip versions. The way this should work is that a daily cron
job should check pip for a new tag release from their GitHub repository. If
there is indeed a new tag release, the PIP_VERSIONS file is to be updated and
the PyTest workflow is to be called. Only that specific pip version should be
checked if the Pippel version is not updated, to save on resources. Finally, the
README file should be updated with the new results.

This should ideally be written as a reusable workflow so that I can call it from
a single 'chores' workflow.