Lift the upper limit for Python version

[soininen]

A function imported from the distutils module that has been removed from Python 3.12 had to be replaced, but otherwise, things seem to work fine.

Re spine-tools/Spine-Toolbox#2522

Checklist before merging

• CHANGELOG.md has been updated
• Unit tests have been added/updated accordingly
• Code has been formatted by black
• Unit tests pass

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.32%. Comparing base (a427173) to head (5bd4c45).

Additional details and impacted files

@@             Coverage Diff             @@
##           0.8-dev     #381      +/-   ##
===========================================
+ Coverage    78.30%   78.32%   +0.02%     
===========================================
  Files           75       75              
  Lines         9495     9504       +9     
  Branches      2011     2015       +4     
===========================================
+ Hits          7435     7444       +9     
+ Misses        1728     1727       -1     
- Partials       332      333       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.