ISTWCMS-4881: Use WebformInterface in uw_sites_all_webform_presave()

This function will only be called with this entity type anyway and it
means we can use methods that are specific to WebformInterface.

uw_sites_all.module

@@ -5,9 +5,9 @@
  * Workbench module file.
  */
 
-use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\menu_link_content\Entity\MenuLinkContent;
+use Drupal\webform\WebformInterface;
 
 /**
  * Implements hook_form_BASE_FORM_ID_alter().
@@ -131,7 +131,7 @@ function uw_sites_all_update_projects_alter(&$projects) {
 /**
  * Implements hook_ENTITY_TYPE_presave().
  */
-function uw_sites_all_webform_presave(EntityInterface $webform): void {
+function uw_sites_all_webform_presave(WebformInterface $webform): void {
   // Add a Webform CAPTCHA component to each newly-created Webform.
   if ($webform->isNew()) {
     $elements = [