How to change menu icon of Support System

Just like in the title. I've checked the menu icon of the Support System is shown via CSS and doesn't use the standard WP dashicons set. I would like to change it so it did. How do I do it?

Usually I use the below function but thid time it doesn't work.

function my_side_menu_tweaks() {
global $menu;
global $submenu;
$submenu[101][4] = 'menu-top menu-icon-tools';
add_action('admin_menu', 'my_side_menu_tweaks');

Any ideas why?