Bump sigstore/gh-action-sigstore-python from 2.0.1 to 2.1.0 (#199)

Bumps [sigstore/gh-action-sigstore-python](https://github.com/sigstore/gh-action-sigstore-python) from 2.0.1 to 2.1.0.
- [Release notes](https://github.com/sigstore/gh-action-sigstore-python/releases)
- [Commits](sigstore/gh-action-sigstore-python@v2.0.1...v2.1.0)

---
updated-dependencies:
- dependency-name: sigstore/gh-action-sigstore-python
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/release.yml

@@ -48,7 +48,7 @@ jobs:
         uses: pypa/gh-action-pypi-publish@v1.8.7
 
       - name: sign
-        uses: sigstore/gh-action-sigstore-python@v2.0.1
+        uses: sigstore/gh-action-sigstore-python@v2.1.0
         with:
           inputs: ./dist/*.tar.gz ./dist/*.whl
           release-signing-artifacts: true