Manual cancellation of the PHP Extended Support is not required.
The Extended Support will automatically end as soon as you switch to a supported PHP version.
Currently, this applies to PHP versions from PHP 8.2 onwards. As soon as you use a newer version, the Extended Support will automatically be deactivated at midnight.
You will receive a confirmation email once the Extended Support has been deactivated.
To end the Extended Support, change your PHP version: How do I change my PHP version?