message: [cli] Make `vercel dev` command exit quickly
  Considering that it's a development environment, it's not important to wait for ongoing HTTP request connections to complete. Sometimes it takes a long time for all the shutdown operations to complete, which makes the command feel sluggish. So let's just `process.exit()` and exit quickly.
diff: @@ -108,8 +108,5 @@ export default async function dev(
  systemEnvValues,
  });
  - process.once('SIGINT', () => devServer.stop());
  - process.once('SIGTERM', () => devServer.stop());
  -
  await devServer.start(...listen);
  }
  