CI: Attempt to manually get cython coverage

[bashtage]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.52%. Comparing base (e210522) to head (6169cd4).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #670      +/-   ##
==========================================
- Coverage   99.54%   99.52%   -0.03%     
==========================================
  Files          99      100       +1     
  Lines       17274    17307      +33     
  Branches     1418     1423       +5     
==========================================
+ Hits        17196    17224      +28     
  Misses         32       32              
- Partials       46       51       +5     

Flag	Coverage Δ
adder	99.50% <ø> (-0.03%)	⬇️
subtractor	99.50% <ø> (-0.03%)	⬇️

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