ci: use xvfb directly from the GA image

Author: gnikit

.github/workflows/main.yaml

@@ -32,14 +32,10 @@ jobs:
       - name: Test Syntax Highlighting
         run: npm run test:grammar
       - name: Test Unittests
-        uses: GabrielBB/xvfb-action@v1
-        with:
-          run: npm run test
+        run: xvfb-run --auto-servernum npm run test
       # This will not fail the job if tests fail so we have to npm test separately
       - name: Coverage report
-        uses: GabrielBB/xvfb-action@v1
-        with:
-          run: npm run coverage
+        run: xvfb-run --auto-servernum npm run coverage
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v3
         with: