Issue #3281405: Add @internal to Automatic Updates validator classes

src/Validator/SettingsValidator.php

@@ -11,6 +11,11 @@ use Drupal\package_manager\Event\PreCreateEvent;
 use Drupal\package_manager\Event\PreOperationStageEvent;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
+/**
+ * @internal
+ *   This class is an internal part of the module's update handling and
+ *   should not be used by external code.
+ */
 class SettingsValidator implements EventSubscriberInterface {
 
   use StringTranslationTrait;