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

| datasource  | package              | from   | to     |
| ----------- | -------------------- | ------ | ------ |
| github-tags | actions/setup-python | v5.6.0 | v6.0.0 |

Author: renovate[bot]

.github/workflows/rigging_pr_description.yaml

@@ -17,7 +17,7 @@ jobs:
           fetch-depth: 0 # full history for proper diffing
 
       - name: Set up Python
-        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
+        uses: actions/setup-python@e797f83bcb11b83ae66e0230d6156d7c80228e7c # v6.0.0
         with:
           python-version: "3.13"