chore(deps): update actions/setup-python action to v6 (#239)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/docs.yml

@@ -31,7 +31,7 @@ jobs:
       - name: setup pages
         uses: actions/configure-pages@v5
       - name: setup python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: 3.x
       - name: setup cache