Fix implicit nullables for PHP 8.4
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3500133. -->
Reported by: [acbramley](https://www.drupal.org/user/1036766)
Related to !53
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>Fix PHP 8.4 deprecations.</p>
issue