use python 3.12, fix codecov

[falkben]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.44%. Comparing base (ab7c422) to head (495bd5d).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #160      +/-   ##
==========================================
+ Coverage   87.57%   89.44%   +1.86%     
==========================================
  Files           6        6              
  Lines         322      322              
==========================================
+ Hits          282      288       +6     
+ Misses         40       34       -6     

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