[TOOLS] Continue raising PHPStan level to 6

plugins/PinnedNotes/Controller/PinnedNotes.php

@@ -29,6 +29,7 @@ use function App\Core\I18n\_m;
 use App\Core\Router;
 use App\Entity\Actor;
 use App\Entity\LocalUser;
+use App\Entity\Note;
 use App\Util\Common;
 use App\Util\Exception\ClientException;
 use App\Util\Exception\NoSuchNoteException;
@@ -39,6 +40,9 @@ use Plugin\PinnedNotes\Entity as E;
 use Symfony\Component\Form\Extension\Core\Type\SubmitType;
 use Symfony\Component\HttpFoundation\Request;
 
+/**
+ * @extends FeedController<Note>
+ */
 class PinnedNotes extends FeedController
 {
     public function listPinsByNickname(Request $request, string $nickname)