add setup-python

.github/workflows/auto_doc.yml

@@ -13,12 +13,11 @@ jobs:
       contents: write
     steps:
     - uses: actions/checkout@v3
+    - uses: actions/setup-python@v4
     - name: Build HTML
       uses: ammaraskar/sphinx-action@master
       with:
         docs-folder: "doc/"
-        python-version: '3.9'
-        cache: 'pip'
 
     - name: Upload artifacts
       uses: actions/upload-artifact@v3