Potential fix for code scanning alert no. 608: Duplicate property

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: ScriptedAlchemy

federated-css/playwright.config.ts

@@ -8,7 +8,6 @@ export default defineConfig({
   expect: {
     timeout: 30_000,
   },
-  workers: process.env.CI ? 1 : undefined,
   fullyParallel: true,
   forbidOnly: !!process.env.CI,
   retries: process.env.CI ? 1 : 0,