fix: remove redundant GitHub release asset upload step

[farhan]

This is a test-run PR so used fix in the commit

The release run failed at the Upload to GitHub Release Assets step with an HTTPError: 422 Unprocessable Entity while it was uploading the xblocks_extra-1.7.1 wheel and sdist to the GitHub release.

Root cause

Starting with v10.6.x, python-semantic-release uploads the built distribution to the VCS release by default, because upload_to_vcs_release now defaults to true. I was not able to find the exact release note or commit that introduced this change. However, a test PR that downgrades PSR to v10.5.3 published successfully without the 422, which confirms that the PSR version is the cause.

Fix

This PR removes the publish-action step , so that PSR no longer attempts to attach assets to the release. The upload-artifact step remains in place, because the publish_to_pypi job depends on it to publish the wheel and sdist to PyPI via OIDC trusted publishing.

Scope of impact

Any repository that has upgraded python-semantic-release to v10.6.x and relies on PSR for its release workflow will run into the same 422 error, so the same fix will need to be applied there as well.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.17%. Comparing base (798088e) to head (cb2f805).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #67   +/-   ##
=======================================
  Coverage   82.17%   82.17%           
=======================================
  Files          48       48           
  Lines        1419     1419           
  Branches      110      110           
=======================================
  Hits         1166     1166           
  Misses        221      221           
  Partials       32       32           

Flag	Coverage Δ
unittests	82.17% <ø> (ø)

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