Fix namespace

Author: tvdijen

tests/XML/ds/SignatureValueTest.php

@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace SimpleSAML\Test\XML\ds;
+namespace SimpleSAML\Test\XMLSecurity\XML\ds;
 
 use PHPUnit\Framework\TestCase;
 use SimpleSAML\Test\XML\SerializableXMLTestTrait;