fix: support deprecated PHP vertions

src/EventSubscriber/FieldConfigIntegrityValidation.php

@@ -23,11 +23,46 @@ use Drupal\jsonapi_extras\ResourceType\NullJsonapiResourceConfig;
  */
 class FieldConfigIntegrityValidation extends ConfigImportValidateEventSubscriberBase {
 
+  /**
+   * The configuration manager.
+   *
+   * @var \Drupal\Core\Config\ConfigManagerInterface
+   */
+  private ConfigManagerInterface $configManager;
+
+  /**
+   * The entity type manager.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+   */
+  private EntityTypeManagerInterface $entityTypeManager;
+
+  /**
+   * The resource type repository.
+   *
+   * @var \Drupal\jsonapi_extras\ResourceType\ConfigurableResourceTypeRepository
+   */
+  private ConfigurableResourceTypeRepository $resourceTypeRepository;
+
+  /**
+   * Creates a new validator.
+   *
+   * @param \Drupal\Core\Config\ConfigManagerInterface $config_manager
+   *   The configuration manager.
+   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+   *   The entity type manager.
+   * @param \Drupal\jsonapi_extras\ResourceType\ConfigurableResourceTypeRepository $resource_type_repository
+   *   The resource type repository
+   */
   public function __construct(
-    private ConfigManagerInterface $configManager,
-    private EntityTypeManagerInterface $entityTypeManager,
-    private ConfigurableResourceTypeRepository $resourceTypeRepository,
-  ) {}
+    ConfigManagerInterface $config_manager,
+    EntityTypeManagerInterface $entity_type_manager,
+    ConfigurableResourceTypeRepository $resource_type_repository,
+  ) {
+    $this->configManager = $config_manager;
+    $this->entityTypeManager = $entity_type_manager;
+    $this->resourceTypeRepository = $resource_type_repository;
+  }
 
   /**
    * @inheritDoc