[VarDumper] Remove duplicate default caster for Socket

#59026 and #59035 was worked on in parallel, which resulted in both PRs adding the entry.

Author: mttsch

Cloner/AbstractCloner.php

@@ -203,8 +203,6 @@ abstract class AbstractCloner implements ClonerInterface
 
         'XmlParser' => ['Symfony\Component\VarDumper\Caster\XmlResourceCaster', 'castXml'],
 
-        'Socket' => ['Symfony\Component\VarDumper\Caster\SocketCaster', 'castSocket'],
-
         'RdKafka' => ['Symfony\Component\VarDumper\Caster\RdKafkaCaster', 'castRdKafka'],
         'RdKafka\Conf' => ['Symfony\Component\VarDumper\Caster\RdKafkaCaster', 'castConf'],
         'RdKafka\KafkaConsumer' => ['Symfony\Component\VarDumper\Caster\RdKafkaCaster', 'castKafkaConsumer'],