Update actions/setup-python action to v5

Author: renovate[bot]

.github/workflows/sign-release.yml

@@ -17,7 +17,7 @@ jobs:
           persist-credentials: false
 
       - name: Set up Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: '3.10'