Remove unused use-statement

modules/admin/lib/Controller/Federation.php

@@ -8,7 +8,6 @@ use Exception;
 use SimpleSAML\Assert\Assert;
 use SimpleSAML\Auth;
 use SimpleSAML\Configuration;
-use SimpleSAML\HTTP\RunnableResponse;
 use SimpleSAML\Locale\Translate;
 use SimpleSAML\Logger;
 use SimpleSAML\Metadata\MetaDataStorageHandler;