fix: bump sigstore/gh-action-sigstore-python from 1.2.3 to 2.1.1

Bumps [sigstore/gh-action-sigstore-python](https://github.com/sigstore/gh-action-sigstore-python) from 1.2.3 to 2.1.1.
- [Release notes](https://github.com/sigstore/gh-action-sigstore-python/releases)
- [Commits](sigstore/gh-action-sigstore-python@v1.2.3...v2.1.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/release.yml

@@ -29,7 +29,7 @@ jobs:
       with:
         repository-url: https://test.pypi.org/legacy/
         skip-existing: true
-    - uses: sigstore/gh-action-sigstore-python@v1.2.3
+    - uses: sigstore/gh-action-sigstore-python@v2.1.1
       with:
         inputs: ./dist/*.tar.gz ./dist/*.whl
         upload-signing-artifacts: true