Add support for Python 3.13

[hugovk]

Still in alpha but let's test already, we might find some upstream bugs to report.

https://peps.python.org/pep-0719/

Also replace Flake8 with Ruff and update some other config.

[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (eade5a7) 55.02% compared to head (a633bc7) 55.18%.

Files	Patch %	Lines
src/osmviz/manager.py	36.84%	12 Missing ⚠️
src/osmviz/animation.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
+ Coverage   55.02%   55.18%   +0.16%     
==========================================
  Files           6        6              
  Lines         438      453      +15     
==========================================
+ Hits          241      250       +9     
- Misses        197      203       +6     

Flag	Coverage Δ
macos-latest	55.18% <45.83%> (+0.16%)	⬆️
ubuntu-latest	55.18% <45.83%> (+0.16%)	⬆️

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