PHP Deprecated: Creation of dynamic property. PHP 8.4

[Xon]

SDK you're using (please complete the following information): 2.23.3

Describe the bug https://wiki.php.net/rfc/deprecate-implicitly-nullable-types

To Reproduce Using php 8.4-dev, and most xero-php-oauth2 objects will trigger deprecation warnings

Expected behavior No deprecation warnings

[github-actions[bot]]

PETOSS-407

[github-actions[bot]]

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