Delete setup.py

[samuelcolvin]

No longer needed as GitHub dependencies supports pyproject.toml

[codecov]

Codecov Report

Merging #260 (99c5917) into main (9f19a18) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #260   +/-   ##
=======================================
  Coverage   99.51%   99.51%           
=======================================
  Files           6        6           
  Lines         416      416           
  Branches       82       82           
=======================================
  Hits          414      414           
  Misses          1        1           
  Partials        1        1           

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