Issue #3258918 by Spokje, longwave: Remove deprecated 'cache.null' service

use Drupal\Core\DependencyInjection\ServiceModifierInterface;

use Drupal\Core\DependencyInjection\ServiceProviderInterface;

use Symfony\Component\DependencyInjection\Compiler\PassConfig;

use Symfony\Component\DependencyInjection\Definition;

use Symfony\Component\DependencyInjection\Reference;

/**

   * {@inheritdoc}

   */

  public function register(ContainerBuilder $container) {

    $definition = new Definition('Drupal\Core\Cache\NullBackend', ['null']);

    $definition->setDeprecated('drupal/core', '8.8.0', 'The "%service_id%\" service is deprecated. While updating Drupal all caches use \Drupal\Core\Update\UpdateBackend. See https://www.drupal.org/node/3066407');

    $definition->setPublic(TRUE);

    $container->setDefinition('cache.null', $definition);

    // Decorate the cache factory in order to use

    // \Drupal\Core\Update\UpdateBackend while running updates.

    $container