ci: Disable attestations on TestPyPI

pypa/gh-action-pypi-publish#283 (comment)

Author: ThiefMaster

.github/workflows/pypi.yml

@@ -70,6 +70,8 @@ jobs:
         with:
           repository-url: https://test.pypi.org/legacy/
           packages-dir: wheel/
+          skip-existing: true
+          attestations: false
       - name: Publish to PyPI 🚀
         uses: pypa/[email protected]
         with: