Apply fixes from StyleCI

[mpociot]

This pull request applies code style fixes from an analysis carried out by StyleCI.

---

For more information, click here.

[what-the-diff]

• Removed*
  -use BeyondCode\LaravelWebSockets\API\TriggerEvent;
  -use GuzzleHttp\Psr7\Request;
  -use Symfony\Component\HttpKernel\Exception\HttpException;