Add support for Python 3.13

John Snowrequested to merge
jsnow/python-qemu-qmp:py313 into main

This series fixes the package.py script for modern setuptools (fixes the build pipeline which has regressed since the last merge) and adds support and tests for Python 3.13.

Python 3.13 is available in alpha in Fedora and is scheduled to release this October, but tests can be run against it now to stay ahead of any possible ecosystem changes that may be needed.

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