[11.x] Import Model class for Renderer\Exception

[seriquynh]

In Renderer\Exception::applicationRouteParametersContext() method, it has a check "$value instanceof Model" but Model class is not imported. So, I just import Model class for Renderer\Exception.

    /**
     * Get the application's route parameters context.
     *
     * @return array<string, mixed>|null
     */
    public function applicationRouteParametersContext()
    {
        $parameters = $this->request()->route()?->parameters();

        return $parameters ? json_encode(array_map(
            fn ($value) => $value instanceof Model ? $value->withoutRelations() : $value,
            $parameters
        ), JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT) : null;
    }