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

Author: renovate[bot]

.github/workflows/publish.yaml

@@ -58,7 +58,7 @@ jobs:
           name: Packages
           path: dist
       - name: Sign the dists with Sigstore
-        uses: sigstore/gh-action-sigstore-python@f514d46b907ebcd5bedc05145c03b69c1edd8b46 # v3.0.0
+        uses: sigstore/gh-action-sigstore-python@f832326173235dcb00dd5d92cd3f353de3188e6c # v3.1.0
         with:
           inputs: >-
             ./dist/*.tar.gz