Python 3.13 support

[Remiol]

Python 3.13 is coming.
Sure, the next Python release won't be out for 3 weeks, but that prevents that after you make the next Buku release compatible with urllib3 > 2.0 that I still can't use it if I download Python 3.13.
Is it possible to make Buku compatible with Python 3.13?

[Remiol]

Version 3.13.0 will be released on October 1.

https://pythoninsider.blogspot.com/2024/09/python-3130rc2-3126-31110-31015-3920.html