Fix problem in Makefile and publish_to_pypi.yml

[rickecon]

This PR fixes an error with setuptools not being available for uploading to PyPI.org.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 43.07%. Comparing base (5051413) to head (9c92deb).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
setup.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #11   +/-   ##
=======================================
  Coverage   43.07%   43.07%           
=======================================
  Files           9        9           
  Lines         643      643           
=======================================
  Hits          277      277           
  Misses        366      366           

Flag	Coverage Δ
unittests	43.07% <33.33%> (ø)

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Files with missing lines	Coverage Δ
usempl_plots/__init__.py	100.00% <100.00%> (ø)
setup.py	0.00% <0.00%> (ø)