3492372 Explicitely nullable types

Closes #3492372

modules/layout_paragraphs_permissions/src/Access/LayoutParagraphsPermissionsBuilderAccess.php

@@ -19,9 +19,9 @@ class LayoutParagraphsPermissionsBuilderAccess extends LayoutParagraphsBuilderAc
   public function access(
     AccountInterface $account,
     LayoutParagraphsLayout $layout_paragraphs_layout,
-    string $operation = NULL,
-    string $component_uuid = NULL,
-    ParagraphsTypeInterface $paragraph_type = NULL
+    ?string $operation = NULL,
+    ?string $component_uuid = NULL,
+    ?ParagraphsTypeInterface $paragraph_type = NULL
   ) {
     $access = parent::access($account, $layout_paragraphs_layout, $operation, $component_uuid, $paragraph_type);
     if ($operation == 'reorder') {