fix(jsonschema): call to an undefined method Symfony\Component\TypeInfo\Type::getClassName()

[Maxcastel]

Fix the followig error:

Error: Call to an undefined method Symfony\Component\TypeInfo\Type::getClassName().
 ------ -------------------------------------------------- 
  Line   src/JsonSchema/SchemaFactory.php                  
 ------ -------------------------------------------------- 
  365    Call to an undefined method                       
         Symfony\Component\TypeInfo\Type::getClassName().  
         🪪  method.notFound                               
 ------ -------------------------------------------------- 

[soyuka]

thanks!