Update Node12 to 16

Author: changjiong

.github/workflows/generate_readme.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Set up Python
         uses: actions/setup-python@v1
         with: