Python3.12

[ericpre]

Based on #3255 and needs hyperspy/rosettasciio#180

Progress of the PR

• Add python 3.12 to the test suite,
• add python 3.12 to setup.py,
• [n/a] update docstring (if appropriate),
• [n/a] update user guide (if appropriate),
• add an changelog entry in the upcoming_changes folder (see upcoming_changes/README.rst),
• Check formatting changelog entry in the readthedocs doc build of this PR (link in github checks)
• add tests,
• ready for review.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (224dca7) 80.86% compared to head (0ad4242) 80.86%.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           RELEASE_next_major    #3256   +/-   ##
===================================================
  Coverage               80.86%   80.86%           
===================================================
  Files                     140      140           
  Lines                   20399    20399           
  Branches                 4825     4825           
===================================================
+ Hits                    16495    16496    +1     
  Misses                   2829     2829           
+ Partials                 1075     1074    -1     

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[CSSFrancis]

Looks good to me!