Remove unused import in UpdateCommand

src/Composer/Command/UpdateCommand.php

@@ -22,7 +22,6 @@ use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Output\OutputInterface;
-use Symfony\Component\Console\Question\ConfirmationQuestion;
 use Symfony\Component\Console\Question\Question;
 
 /**