Update copyright year and modify Gravatar URL to include default image

Author: Carlos Garcia

Core/Model/Base/GravatarTrait.php

@@ -1,7 +1,7 @@
 <?php
 /**
  * This file is part of FacturaScripts
- * Copyright (C) 2022 Carlos Garcia Gomez <carlos@facturascripts.com>
+ * Copyright (C) 2022-2025 Carlos Garcia Gomez <carlos@facturascripts.com>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Lesser General Public License as
@@ -22,7 +22,7 @@
 /**
  * Description of GravatarTrait
  *
- * @author Carlos García Gómez <carlos@facturascripts.com>
+ * @author Carlos García Gómez      <carlos@facturascripts.com>
  * @author Daniel Fernández Giménez <hola@danielfg.es>
  */
 trait GravatarTrait
@@ -33,6 +33,6 @@ trait GravatarTrait
     public function gravatar(int $size = 80): string
     {
         return empty($this->email) ? '' :
-            'https://www.gravatar.com/avatar/' . md5(strtolower(trim($this->email))) . '?s=' . $size;
+            'https://www.gravatar.com/avatar/' . md5(strtolower(trim($this->email))) . '?s=' . $size . '&d=mp';
     }
 }