minor #3822 Update voters_data_permission.rst (mimol91)

This PR was submitted for the 2.4 branch but it was merged into the 2.3 branch instead (closes #3822).

Discussion
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Update voters_data_permission.rst

remove ContainerInterface

Commits
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9710ce1 Update voters_data_permission.rst

cookbook/security/voters_data_permission.rst

@@ -60,7 +60,6 @@ edit a particular object. Here's an example implementation::
     namespace Acme\DemoBundle\Security\Authorization\Voter;
 
     use Symfony\Component\Security\Core\Exception\InvalidArgumentException;
-    use Symfony\Component\DependencyInjection\ContainerInterface;
     use Symfony\Component\Security\Core\Authorization\Voter\VoterInterface;
     use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
     use Symfony\Component\Security\Core\User\UserInterface;