Fix: Pass builtInOnly parameter correctly for list types

When processing ListOfType in mapGraphQLTypeToPHPType, the $builtInOnly
parameter was incorrectly passed as the second argument ($nullable)
instead of the third argument ($builtInOnly).

This caused the $builtInOnly parameter to default to false when
processing list items, resulting in the PHP mapped type being used
instead of the primitive JSON type in $data parameter docblocks.

Example of the bug:
- GraphQL: currencies: [Currency!]!
- Config: withScalar('Currency', Type::string(), Type::object(Currency::class))
- Generated docblock: 'currencies': list<Currency>  (wrong)
- Should be: 'currencies': list<string>  (correct)

This caused PHPStan errors like:
"Parameter #1 $code of class Money\Currency constructor expects
non-empty-string, Money\Currency given."

Author: shahinataei-ts

src/TypeMapper.php

@@ -93,7 +93,7 @@ public function mapGraphQLTypeToPHPType(Type $type, ?bool $nullable = null, bool
         }
 
         if ($type instanceof ListOfType) {
-            return SymfonyType::list($this->mapGraphQLTypeToPHPType($type->getWrappedType(), $builtInOnly));
+            return SymfonyType::list($this->mapGraphQLTypeToPHPType($type->getWrappedType(), null, $builtInOnly));
         }
 
         if ($type instanceof ScalarType) {