Preemptively fix attestation upload for PyPI publish

See <pypa/gh-action-pypi-publish#319>.

Author: caleb531

.github/workflows/publish.yml

@@ -45,6 +45,7 @@ jobs:
         uses: pypa/gh-action-pypi-publish@release/v1
         with:
           repository_url: https://test.pypi.org/legacy/
+          attestations: false
 
       - name: Publish distribution to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1