Change python version of build

.github/workflows/build_docs.yaml

@@ -28,7 +28,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v2
       with:
-        python-version: 3.9  # Adjust the Python version as needed
+        python-version: 3.8  # Adjust the Python version as needed
 
     - name: Install dependencies
       run: |