pyproject.toml (PEP518), test with Python 3.12

[ods]

Changes

• Write pyproject.toml according to PEP518 (fixes editable build and warnings)
• Update Cython
• Add Python 3.12 to test matrices

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> (e.g. 588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the PR
  • ensure type is one of the following:
    • .feature: Signifying a new feature.
    • .bugfix: Signifying a bug fix.
    • .doc: Signifying a documentation improvement.
    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: Fix issue with non-ascii contents in doctest text files.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5266f46) 84.27% compared to head (9deee5e) 84.28%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #944   +/-   ##
=======================================
  Coverage   84.27%   84.28%           
=======================================
  Files          87       87           
  Lines       10039    10039           
=======================================
+ Hits         8460     8461    +1     
+ Misses       1579     1578    -1     

Flag	Coverage Δ
cext	79.33% <ø> (+<0.01%)	⬆️
integration	84.26% <ø> (+<0.01%)	⬆️
purepy	84.00% <ø> (-0.02%)	⬇️
unit	51.44% <ø> (ø)

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