Deprecation warning for pkg_resources

[tangledhelix]

Given a sufficiently new Python install, Ebookmaker runs emit this warning (although it will still run):

C:\Users\jdoe\.virtualenvs\Tools-Am72YoWY\Lib\site-packages\ebookmaker\ParserFactory.py:22:
        UserWarning: pkg_resources is deprecated as an API.
        See https://setuptools.pypa.io/en/latest/pkg_resources.html.
        The pkg_resources package is slated for removal as early as 2025-11-30.
        Refrain from using this package or pin to Setuptools<81.
  from pkg_resources import resource_listdir, resource_stream # pylint: disable=E0611

This happens because pkg_resources was deprecated at some point, as noted near the top of this page.

Also, as of Python 3.12, pkg_resources has been removed from the Python distribution, requiring users to install setuptools to make Ebookmaker work. See #279.