Change logo link in /wp-admin

Pas the following code in the active theme’s functions.php:

/* Change logo link in /wp-admin */
add_filter( 'login_headerurl', 'custom_loginlogo_url' );
function custom_loginlogo_url($url) {
     return '[LINK]';
}

Change link as needed.

Source: https://www.interserver.net/tips/kb/how-to-change-the-logo-and-url-on-the-wordpress-login-page/