[PHP8.6] Deprecation SessionHandlerInterface

[heelc29]

Steps to reproduce the issue

A deprecation is now emitted when implementing SessionHandlerInterface on a class which doesn't define the create_sid() or validateId() methods, as those will be moved from SessionUpdateTimestampHandlerInterface and SessionIdInterface to SessionHandlerInterface.

RFC: Deprecate passing a $sessionhandler object to session_set_save_handler() which does not contain the create_sid() and validateId() methods

PHP Warning:  Class Joomla\Session\Handler\ApcuHandler implementing SessionHandlerInterface is missing the create_sid() method which will be required in PHP 9.0 in joomla\session\src\Handler\ApcuHandler.php on line 19
PHP Warning:  Class Joomla\Session\Handler\ApcuHandler implementing SessionHandlerInterface is missing the validateId() method which will be required in PHP 9.0 in joomla\session\src\Handler\ApcuHandler.php on line 19
PHP Warning:  Class Joomla\Session\Handler\DatabaseHandler implementing SessionHandlerInterface is missing the create_sid() method which will be required in PHP 9.0 in joomla\session\src\Handler\DatabaseHandler.php on line 25
PHP Warning:  Class Joomla\Session\Handler\DatabaseHandler implementing SessionHandlerInterface is missing the validateId() method which will be required in PHP 9.0 in joomla\session\src\Handler\DatabaseHandler.php on line 25
PHP Warning:  Class Joomla\Session\Handler\MemcachedHandler implementing SessionHandlerInterface is missing the create_sid() method which will be required in PHP 9.0 in joomla\session\src\Handler\MemcachedHandler.php on line 19
PHP Warning:  Class Joomla\Session\Handler\MemcachedHandler implementing SessionHandlerInterface is missing the validateId() method which will be required in PHP 9.0 in joomla\session\src\Handler\MemcachedHandler.php on line 19
PHP Warning:  Class Joomla\Session\Handler\RedisHandler implementing SessionHandlerInterface is missing the create_sid() method which will be required in PHP 9.0 in joomla\session\src\Handler\RedisHandler.php on line 19
PHP Warning:  Class Joomla\Session\Handler\RedisHandler implementing SessionHandlerInterface is missing the validateId() method which will be required in PHP 9.0 in joomla\session\src\Handler\RedisHandler.php on line 19
PHP Deprecated:  session_set_save_handler(): Providing an object to argument #1 ($sessionhandler) which does not have the create_sid() method defined is deprecated in joomla\session\src\Storage\NativeStorage.php on line 349

System information (as much as possible)

PHP8.6beta2