⬆️ Update sigstore/gh-action-sigstore-python action to v3 (#1402)

Author: renovate[bot]

.github/workflows/release.yaml

@@ -51,7 +51,7 @@ jobs:
           verbose: true
           print-hash: true
       - name: ✍️ Sign published artifacts
-        uses: sigstore/gh-action-sigstore-python@v2.1.1
+        uses: sigstore/gh-action-sigstore-python@v3.0.0
         with:
           inputs: ./dist/*.tar.gz ./dist/*.whl
           release-signing-artifacts: true