- update to 4.0:
* Drop Python 3.7 support (GL#16)
* Remove ``public.install()`` which was used to inject the
``public`` and ``private`` functions into the ``builtins``
namespace. This isn't very helpful and could be actively
harmful. Explicit is better than implicit. (GL#14)
* The functional form of ``public()`` now returns the argument
*values* in the order they are given. This allows you to
explicitly bind those values to names in the global namespace.
* Switch from ``flake8`` and ``isort`` to ``ruff`` for code
quality. (GL#32)
* Switch to ``pdm-backend`` (GL#15)
* More GitLab CI integration improvements.

* https://gitlab.com/warsaw/public/-/merge_requests/16