Issue #3377237: For now, disallow unattended updates on Windows machines

src/Validator/WindowsValidator.php

 <?php
 
+declare(strict_types = 1);
+
 namespace Drupal\automatic_updates\Validator;
 
 use Drupal\automatic_updates\CronUpdateStage;
@@ -72,4 +74,4 @@ final class WindowsValidator implements EventSubscriberInterface {
     }
   }
 
-}
\ No newline at end of file
+}