Set node version for coactions/setup-xvfb action

.github/workflows/ci.yml

@@ -20,13 +20,18 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+
       - name: Setup Node.js
         uses: actions/setup-node@v4
+
       - name: Install dependencies
         run: npm install
+
       - name: Build package
         run: npm run build
+
       - name: Run headless test
         uses: coactions/setup-xvfb@v1
         with:
+          node-version: '20.x'
           run: npm test