Build with oldest-supported-numpy

[arcondello]

See dwavesystems/dwave-ocean-sdk#208

[codecov-commenter]

Codecov Report

Merging #42 (c2ad646) into main (be12b72) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #42   +/-   ##
=======================================
  Coverage   98.41%   98.41%           
=======================================
  Files          15       15           
  Lines         506      506           
=======================================
  Hits          498      498           
  Misses          8        8           

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