Add pythoon 3.12 as supported version

[fmauch]

Keep up to date...

[fmauch]

Postponing this after refactoring things using a project.toml...

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 0.00%. Comparing base (befb37e) to head (a252afd).

:exclamation: Current head a252afd differs from pull request most recent head 0d83e84

Please upload reports for the commit 0d83e84 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #39       +/-   ##
==========================================
- Coverage   89.24%   0.00%   -89.25%     
==========================================
  Files           6       6               
  Lines         251     251               
==========================================
- Hits          224       0      -224     
- Misses         27     251      +224     

Flag	Coverage Δ
unittests	0.00% <ø> (-89.25%)	:arrow_down:

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