Build documentation with Python 3.12

[jesper-friis]

Description

Downgrade from Python 3.13 to 3.12 when building docs.

We can't use Python 3.13, since the ontopy backend depends on EMMOntoPy and EMMOntoPy doesn't support Python 3.13.

Type of change

• Bug fix and code cleanup
• New feature
• Documentation update
• Testing

Checklist for the reviewer

This checklist should be used as a help for the reviewer.

• Is the change limited to one issue?
• Does this PR close the issue?
• Is the code easy to read and understand?
• Do all new feature have an accompanying new test?
• Has the documentation been updated as necessary?
• Is the code properly tested?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.11%. Comparing base (22f8252) to head (c3466c1).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #404   +/-   ##
=======================================
  Coverage   83.11%   83.11%           
=======================================
  Files          28       28           
  Lines        3897     3897           
=======================================
  Hits         3239     3239           
  Misses        658      658           

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