ci: restrict codecov to a single python version

[beeme1mr]

This PR

• Restricts codecov to a single python version

Notes

This brings the CodeCov config in line with the Python SDK

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.87%. Comparing base (d8e10c7) to head (e615335).
Report is 33 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #93      +/-   ##
==========================================
+ Coverage   90.55%   91.87%   +1.31%     
==========================================
  Files           8       12       +4     
  Lines         180      443     +263     
==========================================
+ Hits          163      407     +244     
- Misses         17       36      +19     

Flag	Coverage Δ
unittests	?

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