Set node version in `workflows/cdn.yml` to 16.x

.github/workflows/cdn.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Install Node.js
         uses: actions/setup-node@v2-beta
         with:
-          node-version: 14.x
+          node-version: 16.x
       - name: Install npm 7
         run: npm install --global npm@7
       - name: Install dependencies