Update sigstore/gh-action-sigstore-python action to v3.1.0

Author: renovate[bot]

.github/workflows/publish-version.yml

@@ -128,7 +128,7 @@ jobs:
           name: package-distributions
           path: dist/
       - name: Sign the dists with Sigstore
-        uses: sigstore/gh-action-sigstore-python@v3.0.0
+        uses: sigstore/gh-action-sigstore-python@v3.1.0
         with:
           inputs: >-
             ./dist/*.tar.gz