Fix ReflectionProperty::getDefaultValue() for properties without default value is deprecated in PHP 8.5

[onlime]

Getting the following deprecation warning on PHP 8.5:

WARNING: ReflectionProperty::getDefaultValue() for a property without a default value is deprecated, use ReflectionProperty::hasDefaultValue() to check if the default value exists in vendor/spatie/laravel-data/src/Support/Factories/DataPropertyFactory.php on line 64  

see https://www.php.net/manual/en/migration85.deprecated.php

Calling ReflectionProperty::getDefaultValue() for properties without default values has been deprecated.