fix: add return types

Author: millnut

src/Element/UKAddressLookup.php

@@ -85,7 +85,7 @@ public static function getCompositeElements(array $element) {
   /**
    * {@inheritdoc}
    */
-  public static function validateWebformComposite(&$element, FormStateInterface $form_state, &$complete_form): void {
+  public static function validateWebformComposite(&$element, FormStateInterface $form_state, &$complete_form) {
     // IMPORTANT: Must get values from the $form_states since sub-elements
     // may call $form_state->setValueForElement() via their validation hook.
     // @see \Drupal\webform\Element\WebformEmailConfirm::validateWebformEmailConfirm