Add python 3.12 support in CI and metadata

[Pierre-Sassoulas]

Follow-up and blocked by #23

Closes #12

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (69ad82f) 93.97% compared to head (845dd66) 92.77%.

❗ Current head 845dd66 differs from pull request most recent head 4070f90. Consider uploading reports for the commit 4070f90 to get more accurate results

Files	Patch %	Lines
tests/base_tester.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
- Coverage   93.97%   92.77%   -1.20%     
==========================================
  Files          18       18              
  Lines         548      554       +6     
  Branches      106      108       +2     
==========================================
- Hits          515      514       -1     
- Misses         23       28       +5     
- Partials       10       12       +2     

Flag	Coverage Δ
3.10	92.59% <0.00%> (-1.38%)	⬇️
3.11	92.59% <0.00%> (-1.38%)	⬇️
3.12	92.59% <0.00%> (?)
3.6	92.59% <0.00%> (?)
3.7	92.59% <0.00%> (?)
3.8	92.59% <0.00%> (-1.38%)	⬇️
3.9	92.59% <0.00%> (-1.38%)	⬇️
macos-latest	92.59% <0.00%> (-1.38%)	⬇️
ubuntu-20.04	92.59% <0.00%> (?)
ubuntu-latest	92.59% <0.00%> (-1.38%)	⬇️
windows-latest	92.59% <0.00%> (-1.38%)	⬇️

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[stdedos]

Superseded / Fixed by #8 (e0526a8?)

See #8 (comment) for more details

... and #8 (comment)