[CI] Add Python 3.12

[mshr-h]

No description provided.

[mshr-h]

https://github.com/microsoft/hummingbird/actions/runs/9695338444/job/26754887915?pr=781
The above CI error occurs because PySpark removed its dependency on the distutils package, which was removed in Python 3.12. But the latest PySpark (3.5.1) doesn't include it.
Seems like 4.0.0 will have it. The preview was released on June 3, so I guess the stable version will be released within a few weeks.
https://issues.apache.org/jira/browse/SPARK-45390
#793

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.52%. Comparing base (4f280ab) to head (df35a88).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #781   +/-   ##
=======================================
  Coverage   87.52%   87.52%           
=======================================
  Files          76       76           
  Lines        4625     4625           
  Branches      741      741           
=======================================
  Hits         4048     4048           
  Misses        375      375           
  Partials      202      202           

Flag	Coverage Δ
unittests	87.52% <ø> (ø)

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