Revert "Set node version for coactions/setup-xvfb action"

This reverts commit e4803c6.

Author: exceptionraiser

.github/workflows/ci.yml

@@ -20,18 +20,13 @@ 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