Add python 3.12 for test

[brian-goo]

No description provided.

[codecov]

Codecov Report

Merging #427 (581183b) into main (ab2dda2) will decrease coverage by 0.19%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #427      +/-   ##
==========================================
- Coverage   98.40%   98.21%   -0.19%     
==========================================
  Files          11       11              
  Lines        1063     1063              
  Branches      200      200              
==========================================
- Hits         1046     1044       -2     
- Misses          8        9       +1     
- Partials        9       10       +1     

see 1 file with indirect coverage changes

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[samuelcolvin]

Thanks so much for the contribution, this is replaced by #439 where I've fixed lots of related things.