Update main.yml

.github/workflows/main.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v1
         with:
-            python-version: '3.8'
+            python-version: '3.10'
       - name: Install dependencies
         run: |
           pip install mkdocs mkdocs-rtd-dropdown