CI: Roll-back coverage python to 3.12

[hombit]

There is probably some issue with numpy<2 and python 3.13?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.44%. Comparing base (30dee06) to head (f08fdfa).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #435   +/-   ##
=======================================
  Coverage   82.44%   82.44%           
=======================================
  Files           9        9           
  Lines        2564     2564           
=======================================
  Hits         2114     2114           
  Misses        450      450           

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

[codspeed-hq]

CodSpeed Performance Report

Merging #435 will not alter performance

_{Comparing ci-roll-back-coverage-to-3.12 (f08fdfa) with master (272e517)}

Summary

✅ 99 untouched benchmarks