[ci]修正GitHub Actions工作流中的缩进问题，确保Node.js安装步骤的配置正确。

packages/stdf/.github/workflows/releases-demo.yml

@@ -15,8 +15,8 @@ jobs:
       - name: Install Node.js
         uses: actions/setup-node@v4
         with:
-        node-version: 20
-        cache: npm
+          node-version: 20
+          cache: npm
 
       - name: Install dependencies
         run: npm install