Remove nullable modifier from author name as it is now never null

Author: emmadesilva

packages/framework/src/Framework/Features/Blogging/Models/PostAuthor.php

@@ -27,7 +27,7 @@ class PostAuthor implements Stringable
     /**
      * The display name of the author.
      */
-    public readonly ?string $name;
+    public readonly string $name;
 
     /**
      * The author's website URL.