chore: fix download-artifact in publish-testpypi missing name and path

[pesap]

Summary

• Add missing name and path to the download-artifact step in publish-testpypi

Why

The publish-testpypi job was missing name: python-package-distributions and path: dist/ on its download-artifact step. Without these, the artifact lands in a subdirectory instead of dist/, causing pypa/gh-action-pypi-publish to fail with FileNotFoundError: No such file or directory: '/github/workspace/dist'.

The publish-pypi job already had these set correctly.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.63%. Comparing base (8bfc3aa) to head (7e260d2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #111   +/-   ##
=======================================
  Coverage   95.63%   95.63%           
=======================================
  Files           8        8           
  Lines        1719     1719           
=======================================
  Hits         1644     1644           
  Misses         75       75           

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