Change default target python version to 3.8

[koxudaxi]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #2061 will not alter performance

_{Comparing change_default_target_python_version_to_3.8 (7a04ad9) with main (04d6b03)}

Summary

✅ 31 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (04d6b03) to head (7a04ad9).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #2061   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           38        38           
  Lines         4192      4191    -1     
  Branches       974       974           
=========================================
- Hits          4192      4191    -1     

Flag	Coverage Δ
unittests	99.64% <100.00%> (-0.01%)	⬇️

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