Update sigstore

Author: EthanSteinberg

.github/workflows/python-build.yml

@@ -91,7 +91,7 @@ jobs:
         path: dist/
 
     - name: Sign the dists with Sigstore
-      uses: sigstore/gh-action-sigstore-python@v2.1.1
+      uses: sigstore/gh-action-sigstore-python@v3.0.1
       with:
         inputs: >-
           ./dist/*.tar.gz