Fix tests namespaces

Author: ogizanagi

Tests/ValidationTest.php

@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\Component\Validator\Tests\Validator;
+namespace Symfony\Component\Validator\Tests;
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Validator\Constraints\Email;