Bump sigstore/gh-action-sigstore-python from 3.0.1 to 3.1.0

Bumps [sigstore/gh-action-sigstore-python](https://github.com/sigstore/gh-action-sigstore-python) from 3.0.1 to 3.1.0.
- [Release notes](https://github.com/sigstore/gh-action-sigstore-python/releases)
- [Changelog](https://github.com/sigstore/gh-action-sigstore-python/blob/main/CHANGELOG.md)
- [Commits](https://github.com/sigstore/gh-action-sigstore-python/compare/v3.0.1...v3.1.0)

---
updated-dependencies:
- dependency-name: sigstore/gh-action-sigstore-python
  dependency-version: 3.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/release.yml

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index e3e03ee..5f74536 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -73,7 +73,7 @@
           path: dist/
       - name: Sign the dists with Sigstore and upload assets to Github release
         if: github.event_name == 'release'
-        uses: sigstore/gh-action-sigstore-python@v3.0.1
+        uses: sigstore/gh-action-sigstore-python@v3.1.0
         with:
           inputs: |
             ./dist/*.tar.gz