PHP warning

Hello, thanks for the plugin. Could you please make it work with PHP8+ without warnings? One of my email accounts gets messed up with PHP warnings from cron.

PHP Warning: Undefined array key "REQUEST_METHOD" in .../plugins/clear-autoptimize-cache-automatically/clear-autoptimize-cache-automatically.php on line 99

It would probably be enough to change line 99 of the php file from

if ( $_SERVER['REQUEST_METHOD'] === 'POST' ) {

to

if ( isset($_SERVER['REQUEST_METHOD']) && $_SERVER['REQUEST_METHOD'] === 'POST' ) {

thanks, Andreas