Fix numpy pinning in wheels

[tlambert03]

fixes #45

[codecov]

Codecov Report

Merging #46 (24b29e4) into main (941958d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #46   +/-   ##
=======================================
  Coverage   86.21%   86.21%           
=======================================
  Files          10       10           
  Lines        1110     1110           
=======================================
  Hits          957      957           
  Misses        153      153           

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