Use Python 3.11

.github/workflows/documentation.yaml

@@ -12,15 +12,19 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Set up Python
-      - uses: actions/setup-python@v5
+        uses: actions/setup-python@v5
         with:
           python-version: '3.11'
+
       - name: Install dependencies
+        shell: bash
         run: |
           pip install -U -e .'[doc]'
+
       - name: Sphinx build
         run: |
           sphinx-build doc _build
+
       - name: Deploy to GitHub Pages
         uses: peaceiris/actions-gh-pages@v3
         if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}