Add missing 'preferRelatedApplications' attribute to Manifest Dto (#160)

Added missing attribute 'preferRelatedApplications' to the Manifest data transfer object (Dto). This boolean property defaults to false and indicates whether applications listed under 'relatedApplications' should be preferred over the browser.

src/Dto/Manifest.php

@@ -96,6 +96,9 @@ final class Manifest
     #[SerializedName('related_applications')]
     public array $relatedApplications = [];
 
+    #[SerializedName('prefer_related_applications')]
+    public bool $preferRelatedApplications = false;
+
     /**
      * @var array<Shortcut>
      */