Remove Python 3.7 support

[kajinamit]

Python 3.7 already reached its EOL on 2023-06-27[1].

[1] https://devguide.python.org/versions/

[mtreinish]

LGTM, we tend to support a python version past the eol date a bit so people can still test code as they migrate to a newer version. But I agree it's been long enough now. Thanks for doing this.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cc66736) 61.95% compared to head (642f130) 61.95%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #359   +/-   ##
=======================================
  Coverage   61.95%   61.95%           
=======================================
  Files          30       30           
  Lines        2618     2618           
  Branches      426      426           
=======================================
  Hits         1622     1622           
  Misses        877      877           
  Partials      119      119           

Flag	Coverage Δ
unittests	61.95% <ø> (ø)

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