minor #11802 [HttpKernel] add use statement for phpdoc (Miliooo)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #11802).

Discussion
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[HttpKernel] add use statement for phpdoc

| Q             | A
| ------------- | ---
| Fixed tickets | https://github.com/symfony/symfony/issues/11801
| License       | MIT

Added use statement for the Phpdoc

Commits
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0010fba [HttpKernel] add use statement for phpdoc

src/Symfony/Bundle/FrameworkBundle/EventListener/SessionListener.php

@@ -17,6 +17,7 @@ use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpFoundation\Session\SessionInterface;
 
 /**
  * Sets the session in the request.