Update Sigstore action to version 3.1.0

Author: amanjaiswal73892

.github/workflows/pypi.yml

@@ -86,7 +86,7 @@ jobs:
           path: dist/
 
       - name: Sign the dists with Sigstore
-        uses: sigstore/gh-action-sigstore-python@v2.1.1
+        uses: sigstore/gh-action-sigstore-python@v3.1.0
         with:
           inputs: >-
             ./dist/*.tar.gz