remove distutils function and change packaging.version

[ifurther]

distutils is removed in new version python

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.05% ⚠️

Comparison is base (a890fa4) 88.43% compared to head (2a8c2bf) 88.38%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #37      +/-   ##
==========================================
- Coverage   88.43%   88.38%   -0.05%     
==========================================
  Files          11       11              
  Lines         536      534       -2     
==========================================
- Hits          474      472       -2     
  Misses         62       62              

Files Changed	Coverage Δ
mpl_scatter_density/tests/__init__.py	100.00% <100.00%> (ø)

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[astrofrog]

Thanks for the PR! I have rebased this now that I've fixed the CI infrastructure.

[astrofrog]

We no longer need to use setup.py and we also don't need to check for the version in the tests anymore so actually simplifying this by removing the deprecated code.