test against Python 3.12 and bump python versions used in CI

[andersy005]

Description of proposed changes

• towards Drop support for Python=3.9 #230

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.27%. Comparing base (43c9135) to head (f4918c0).
Report is 25 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #231      +/-   ##
==========================================
+ Coverage   96.25%   96.27%   +0.02%     
==========================================
  Files           6        6              
  Lines         347      349       +2     
  Branches       82       82              
==========================================
+ Hits          334      336       +2     
  Misses          8        8              
  Partials        5        5              

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