support python 3.13

[sarahwooders]

Hello! Would it be possible to run pgserver with Python 3.13?

[adsharma]

https://github.com/adsharma/pgserver/actions/runs/17193571691

has wheels for python-3.13 for x64. No luck with aarch64 yet.

[adsharma]

https://github.com/Ladybug-Memory/pgembed is a fork with wheels available via https://pypi.org/project/pgembed/