Update GitHub Actions workflow to use Node.js 20.x, enable npm caching, and specify npm registry URL

Author: syucream

.github/workflows/publish.yml

@@ -12,6 +12,10 @@ jobs:
 
       - name: Setup Node.js
         uses: actions/setup-node@v4
+        with:
+          node-version: '20.x'
+          cache: 'npm'
+          registry-url: 'https://registry.npmjs.org'
 
       - name: Install dependencies
         run: npm ci