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