[Suggestion] drop suppport for Python 3.7

[Midnighter]

Python 3.7 has reached end-of-life and several vulnerabilities have been discovered in numpy and scipy that themselves no longer support 3.7.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e605daa) 83.94% compared to head (2da1c76) 83.94%.

❗ Current head 2da1c76 differs from pull request most recent head d910a41. Consider uploading reports for the commit d910a41 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##            devel    #1352   +/-   ##
=======================================
  Coverage   83.94%   83.94%           
=======================================
  Files          66       66           
  Lines        5499     5499           
  Branches     1257     1257           
=======================================
  Hits         4616     4616           
  Misses        567      567           
  Partials      316      316           

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[cdiener]

Absolutely, makes perfect sense.