chore(deps): update sigstore/gh-action-sigstore-python action to v3.4.0

Author: renovate[bot]

.github/workflows/publish.yml

@@ -70,7 +70,7 @@ jobs:
           name: python-package-distributions
           path: dist/
       - name: Sign the dists with Sigstore
-        uses: sigstore/gh-action-sigstore-python@v3.0.1
+        uses: sigstore/gh-action-sigstore-python@v3.4.0
         with:
           inputs: >-
             ./dist/*.tar.gz