Fix PyPI wheel builds

[mdekstrand]

Windows PyPI wheel builds were failing, let's fix.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.48%. Comparing base (ea71939) to head (dc16ad7).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1071   +/-   ##
=======================================
  Coverage   89.48%   89.48%           
=======================================
  Files         231      231           
  Lines       15867    15867           
=======================================
  Hits        14199    14199           
  Misses       1668     1668           

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