ci: update xvfb action #3431

Problem:
https://github.com/GabrielBB/xvfb-action is deprecated and hasn't been
updated since 2021:

Solution:
Use https://github.com/coactions/setup-xvfb instead.

Author: justinmk3

.github/workflows/node.js.yml

@@ -29,7 +29,7 @@ jobs:
             - run: npm ci
             - run: npm run vscode:prepublish
             - name: Tests
-              uses: GabrielBB/xvfb-action@v1
+              uses: coactions/setup-xvfb@v1
               with:
                   run: npm test
             - name: Code coverage