Bump sigstore/gh-action-sigstore-python from 3.2.0 to 3.3.0 (aio-libs#12285)

Author: dependabot[bot]

.github/workflows/ci-cd.yml

@@ -641,7 +641,7 @@ jobs:
       uses: pypa/gh-action-pypi-publish@release/v1
 
     - name: Sign the dists with Sigstore
-      uses: sigstore/gh-action-sigstore-python@v3.2.0
+      uses: sigstore/gh-action-sigstore-python@v3.3.0
       with:
         inputs: >-
           ./dist/*.tar.gz