pack: change node version for workflow

.github/workflows/documents.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v3
         with:
-          node-version: '18'
+          node-version: '20'
 
       # copy and replace string index.md file
       - name: Copy and replace string index.md file