Issue #3431155: Drupal 11

Closes #3431155

src/Annotation/JsonLdEntity.php

 <?php
 
+declare(strict_types=1);
+
 namespace Drupal\json_ld_schema\Annotation;
 
 use Drupal\Component\Annotation\Plugin;
@@ -11,18 +13,7 @@ use Drupal\Component\Annotation\Plugin;
  */
 class JsonLdEntity extends Plugin {
 
-  /**
-   * The plugin ID.
-   *
-   * @var string
-   */
-  public $id;
-
-  /**
-   * The label.
-   *
-   * @var string
-   */
-  public $label;
+  public string $id;
+  public string $label;
 
 }