Missing root_id in Relationship object

[ajhar-euka]

Description of the Bug

In src/Resources/Customer/Relationship.php, it appears that the root_id property has been removed or is no longer exposed. When calling:
CB::init()->subscription()->retrieve($subscriptionId)->customer

the resulting Relationship object does not include root_id, even though the raw API response does contain it under the customer relationship.

this is an intentional change or a bug?

Steps to reproduce

$subscription = CB::init()->subscription()->retrieve($subscriptionId);
$customer = $subscription->customer;

Observe that the root_id property is missing from the $customer relationship object.

Now retrieve the raw API response for the same subscription:
$rawData = CB::init()->subscription()->retrieve($subscriptionId)->getRawResponseData();

Observe that the root_id property is from the $customer relationship object.

Expected Behavior

root_id should be in customer relationship object

Code Snippets (if applicable)

Operating System

Ubuntu 24.04.1 LTS

Language version

PHP 8.2

Library version

v4.2.0

Additional context

No response