prevent failures around not existing TypeInfo classes

Having a getType() method on an extractor is not enough. Such a method may
exist to be forward-compatible with the TypeInfo component. We still must
not call it if the TypeInfo component is not installed to prevent running into
errors for not-defined classes when the TypeInfo component is not installed.

Author: xabbuh

Diff for: Normalizer/AbstractObjectNormalizer.php

@@ -938,7 +938,7 @@ private function getType(string $currentClass, string $attribute): Type|array|nu
      */
     private function getPropertyType(string $className, string $property): Type|array|null
     {
-        if (method_exists($this->propertyTypeExtractor, 'getType')) {
+        if (class_exists(Type::class) && method_exists($this->propertyTypeExtractor, 'getType')) {
             return $this->propertyTypeExtractor->getType($className, $property);
         }