Bump Python version

.github/workflows/sphinx.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v2
         with:
-          python-version: '3.11'
+          python-version: '3.12'
 
       - name: Install dependencies
         run: pip install -r Docs/requirements.txt && pip install -r requirements.txt