Update installation.mdx

Author: jbrooksuk

v3.x/installation.mdx

@@ -12,7 +12,7 @@ description: 'Learn how to install Cachet on your server.'
 
 Cachet v3.x is written in PHP with Laravel 11.x and requires:
 
-- PHP 8.2 or 8.3
+- PHP 8.2, 8.3 or 8.4
 - [Composer](https://getcomposer.org)
 - SQLite, MySQL, MariaDB, PostgreSQL, or SQL Server