Make versioneer.py use setuptools instead of distutils

[jwodder]

Distutils was officially deprecated in Python 3.10 and will be removed from the standard library completely in 3.12. This PR thus removes the use of distutils from the code.

[codecov-commenter]

Codecov Report

Merging #54 (10068b6) into master (e7aaaf9) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #54   +/-   ##
=======================================
  Coverage   92.67%   92.67%           
=======================================
  Files           3        3           
  Lines         382      382           
  Branches       44       44           
=======================================
  Hits          354      354           
  Misses         17       17           
  Partials       11       11           

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[yarikoptic]

thank you!