remove unused statements

src/Composer/Factory.php

@@ -17,11 +17,9 @@ use Composer\Json\JsonFile;
 use Composer\IO\IOInterface;
 use Composer\Package\Archiver;
 use Composer\Repository\RepositoryManager;
-use Composer\Repository\RepositoryInterface;
 use Composer\Repository\WritableRepositoryInterface;
 use Composer\Util\ProcessExecutor;
 use Composer\Util\RemoteFilesystem;
-use Composer\Util\Filesystem;
 use Symfony\Component\Console\Formatter\OutputFormatterStyle;
 use Composer\EventDispatcher\EventDispatcher;
 use Composer\Autoload\AutoloadGenerator;