Update for PEP 639

[jwodder]

Blockers:

• Wait for Update the default version of core metadata to 2.4 pypa/hatch#1829 to be released in a new hatchling version
• Wait for Switch to packaging for parsing metadata and support metadata 2.4 pypa/twine#1180 to be released in a new twine version

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.45%. Comparing base (aec601f) to head (b74041a).
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #62   +/-   ##
=======================================
  Coverage   79.45%   79.45%           
=======================================
  Files          24       24           
  Lines        1533     1533           
  Branches      219      219           
=======================================
  Hits         1218     1218           
  Misses        268      268           
  Partials       47       47           

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