Deprecated function: Creation of dynamic property Drupal\linkchecker\Form\LinkCheckerAdminSettingsForm::$moduleHandler is deprecated

Working on it.

Hi @alex9000,
This warning is due to the dynamic property $moduleHandler being assigned directly in the constructor of LinkCheckerAdminSettingsForm.
So we require a docblock comment in order to remove the warning.

I see that that docblock is present in 2.0.x and 2.1.x but it is not present when you do composer require 'drupal/linkchecker:^2.0' so you can use these versions instead or you can explicitly write this docblock.

  /**
   * ModuleHandler service.
   *
   * @var \Drupal\Core\Extension\ModuleHandlerInterface
   */
  protected $moduleHandler;

@vladimiraus please check this.

Thanks,
Arun