Recommend build instead of invoking setup.py directly

[hugovk]

Fixes #424.

Use https://github.com/pypa/build instead of invoking setup.py directly.

See https://blog.ganssle.io/articles/2021/10/setup-py-deprecated.html for the long version.

And https://blog.ganssle.io/articles/2021/10/setup-py-deprecated.html#summary for the summary.

[codecov]

Codecov Report

Merging #439 (d98afff) into main (0e07002) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #439   +/-   ##
=======================================
  Coverage   67.57%   67.57%           
=======================================
  Files          12       12           
  Lines         916      916           
=======================================
  Hits          619      619           
  Misses        297      297           

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[agronholm]

Thanks!