chore(deps): update actions/setup-python action to v6

Author: renovate[bot]

.github/workflows/sync-requirements.yml

@@ -31,7 +31,7 @@ jobs:
           version: "latest"
 
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version-file: ".python-version"