Enable attestations for PyPI action

[shenanigansd]

ref: https://github.com/pypa/gh-action-pypi-publish#generating-and-uploading-attestations

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 13.88%. Comparing base (bd9b9de) to head (28b765a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #10   +/-   ##
=======================================
  Coverage   13.88%   13.88%           
=======================================
  Files           5        5           
  Lines          36       36           
=======================================
  Hits            5        5           
  Misses         31       31           

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