ci: Update sigstore action to avoid using deprecated artifact actions

Author: achimnol

.github/workflows/ci-cd.yml

@@ -243,7 +243,7 @@ jobs:
       uses: pypa/gh-action-pypi-publish@release/v1
 
     - name: Sign the dists with Sigstore
-      uses: sigstore/gh-action-sigstore-python@v2.1.1
+      uses: sigstore/gh-action-sigstore-python@v3.2.0
       with:
         inputs: >-
           ./dist/${{ env.PROJECT_NAME }}*.tar.gz