BUG: setup.py based installs are deprecated

[pcmoore]

As seen on the main branch:

Making install in python
running install
/usr/lib/python3.12/site-packages/setuptools/_distutils/cmd.py:66: SetuptoolsDeprecationWarning: setup.py install is deprecated.
!!

        ********************************************************************************
        Please avoid running ``setup.py`` directly.
        Instead, use pypa/build, pypa/installer or other
        standards-based tools.

        See https://blog.ganssle.io/articles/2021/10/setup-py-deprecated.html for details.
        ********************************************************************************

!!

The mentioned blog post, https://blog.ganssle.io/articles/2021/10/setup-py-deprecated.html, has a table at the end with possible conversions.