ci: multipy runtime tests 3.7-3.10

[d4l3k]

This adds non Python 3.8 versions to our CI

3.7 should work but there's no libpython-static==3.7 in conda, only 3.8+

Test plan:

CI

[codecov[bot]]

Codecov Report

Merging #128 (ed13a9f) into main (2378dec) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #128   +/-   ##
=======================================
  Coverage   88.86%   88.86%           
=======================================
  Files          65       65           
  Lines        3869     3869           
=======================================
  Hits         3438     3438           
  Misses        431      431           

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