Add missing dependencies to Barcode's composer.json

`zendframework/zend-servicemanager` and `zendframework/zend-validator` are required dependencies for the Barcode component. They are missing from its `composer.json`.

This PR add the required dependency.

The related errors are:
* `Fatal error: Class 'Zend\ServiceManager\AbstractPluginManager' not found in /project/vendor/zendframework/zend-barcode/Zend/Barcode/ObjectPluginManager.php on line 22`
* `Fatal error: Class 'Zend\Validator\Barcode' not found in /project/vendor/zendframework/zend-barcode/Zend/Barcode/Object/AbstractObject.php on line 1200`