cibw: Disable building PyPy wheels on all platforms

[mr-c]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.82%. Comparing base (b4b5f34) to head (df86a7c).
⚠️ Report is 31 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2134      +/-   ##
==========================================
+ Coverage   84.80%   84.82%   +0.02%     
==========================================
  Files          46       46              
  Lines        8376     8376              
  Branches     1966     1966              
==========================================
+ Hits         7103     7105       +2     
+ Misses        806      803       -3     
- Partials      467      468       +1     

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