[MNT] EOL for python 3.8

[fkiraly]

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EOL PR for python 3.8 - this removes python 3.8 support from the package, and the tests.

For release 1.2.0.

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.14%. Comparing base (ff1a7bd) to head (55dccc9).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1661   +/-   ##
=======================================
  Coverage   90.14%   90.14%           
=======================================
  Files          32       32           
  Lines        4780     4780           
=======================================
  Hits         4309     4309           
  Misses        471      471           

Flag	Coverage Δ
cpu	90.14% <ø> (ø)
pytest	90.14% <ø> (ø)

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