Remove unneeded use statements

Author: fabpot

Tests/SerializerTest.php

@@ -62,7 +62,6 @@
 use Symfony\Component\Serializer\Tests\Fixtures\DummyObjectWithEnumProperty;
 use Symfony\Component\Serializer\Tests\Fixtures\DummyWithObjectOrNull;
 use Symfony\Component\Serializer\Tests\Fixtures\DummyWithVariadicParameter;
-use Symfony\Component\Serializer\Tests\Fixtures\DummyWithVariadicProperty;
 use Symfony\Component\Serializer\Tests\Fixtures\FalseBuiltInDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\FooImplementationDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\FooInterfaceDummyDenormalizer;