[SecurityBundle] Add missing fixXmlConfig() call for issuer

Author: OskarStark

DependencyInjection/Security/AccessToken/OidcTokenHandlerFactory.php

@@ -91,6 +91,7 @@ public function addConfiguration(NodeBuilder $node): void
  $node
  ->arrayNode($this->getKey())
  ->fixXmlConfig($this->getKey())
+ ->fixXmlConfig('issuer')
  ->validate()
  ->ifTrue(static fn ($v) => !isset($v['algorithm']) && !isset($v['algorithms']))
  ->thenInvalid('You must set either "algorithm" or "algorithms".')