JsonApi\Controller\AbstractController::json() should not be extended from parent

[netandreus]

Need to replace JsonApi\Controller\AbstractController::json() with some other code without extending it from Symfony\Bundle\FrameworkBundle\Controller\AbstractController.

The "Symfony\Bundle\FrameworkBundle\Controller\AbstractController::json()" method is considered final. It may change without further notice as of its next major version. You should not extend it from "JsonApi\Controller\AbstractController".
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{▼
  /vendor/symfony/debug/DebugClassLoader.php:204 {▶}
  /src/Controller/JsonApi/ItemController.php:17 {▼
    ›  */
    › class ItemController extends AbstractController
    › {
  }
}

Symfony version: 4.4.13.
PHP version: 7.2.31