Review CronTask.php

Current CronTask implements a deprecated function and references a non-existing method (according to Sonar).

```php
/**
* @deprecated 11.0.0
*/
class QueryExpression extends Glpi\DBAL\QueryExpression
```
The implementation should be aligned with the GLPI11 core. Possibly the task is not functional in the current implementation.

Start by reviewing CronTask.php and the Sonar findings about the deprecated function and non-existing method, then compare its implementation with the GLPI 11 core. Confirm the intended CronTask behavior and update it so the task is functional and aligned with GLPI 11.

Written by the indexing model from the issue text.