Fix blob resource referencing itself while serializing instead of parent

Author: chr-hertel

src/Schema/Content/BlobResourceContents.php

@@ -79,7 +79,7 @@ public function jsonSerialize(): array
     {
         return [
             'blob' => $this->blob,
-            ...$this->jsonSerialize(),
+            ...parent::jsonSerialize(),
         ];
     }
 }