chore(deps): update actions/setup-python action to v6 (#254)

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

Signed-off-by: renovate-sh-app[bot] <219655108+renovate-sh-app[bot]@users.noreply.github.com>
Co-authored-by: renovate-sh-app[bot] <219655108+renovate-sh-app[bot]@users.noreply.github.com>

Author: renovate-sh-app[bot]

.github/workflows/publish-docs.yaml

@@ -17,7 +17,7 @@ jobs:
           fetch-depth: 0
           persist-credentials: false
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@e797f83bcb11b83ae66e0230d6156d7c80228e7c # v6
 
       - name: Install dependencies
         run: pip install -r .mkdocs/requirements.txt