fix(release): update WP_Ultimo::VERSION constant and @Version tag to 2.5.1

Author: superdav42

inc/class-wp-ultimo.php

@@ -31,7 +31,7 @@ final class WP_Ultimo {
 	 * @since 2.1.0
 	 * @var string
 	 */
-	const VERSION = '2.4.13-beta.1';
+	const VERSION = '2.5.1';
 
 	/**
 	 * Core log handle for Ultimate Multisite.

ultimate-multisite.php

@@ -29,7 +29,7 @@
  * @author   Arindo Duque, NextPress, WPMUDEV, and the Ultimate Multisite Community
  * @category Core
  * @package  Ultimate_Multisite
- * @version 2.4.13-beta.1
+ * @version 2.5.1
  */
 
 // Exit if accessed directly