feat: add support for Python 3.12

[RobPasMue]

As title says

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[RobPasMue]

We should also drop support for Python 3.8 at some point @germa89 ... unless strictly necessary

[RobPasMue]

Requires release of ansys-mapdl-reader

[codecov]

Codecov Report

Merging #2507 (274a6da) into main (949b8d8) will decrease coverage by 0.03%.
Report is 8 commits behind head on main.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2507      +/-   ##
==========================================
- Coverage   83.83%   83.81%   -0.03%     
==========================================
  Files          44       44              
  Lines        8685     8685              
==========================================
- Hits         7281     7279       -2     
- Misses       1404     1406       +2     

[RobPasMue]

Some stages are failing for "local" builds. I'd suggest merging but I will leave it up to @clatapie and @germa89 to decide...

[germa89]

Thank you a lot @RobPasMue for your valuable contribution!