Python3.8 EOL

[mbkumar]

Python reached EOL in Oct 2024. This PR removes support for 3.8 and drops support for the pre-numpy2.0 style of installing numpy.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.66%. Comparing base (9fc2c36) to head (6b29fdf).
Report is 14 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #460   +/-   ##
=======================================
  Coverage   92.66%   92.66%           
=======================================
  Files          78       78           
  Lines       14514    14514           
=======================================
  Hits        13450    13450           
  Misses       1064     1064           

Flag	Coverage Δ
unittests	92.66% <ø> (ø)

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[landreman]

Looks fine, if you can fix the wheel action?

[mbkumar]

@landreman Done.