Update CORE_PHP_MAX to 8.4
>>> [!note] Migrated issue
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<!-- Migrated from issue #3496181. -->
Reported by: [berdir](https://www.drupal.org/user/214652)
Related to !312 !311
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>Drupal 10.4 (maybe latest dev only at the moment) and 11.1 now support PHP 8.4 and people are filling issues about PHP 8.4 deprecation in contrib projects: <span class="drupalorg-gitlab-issue-link project-issue-status-info project-issue-status-3"><a href="https://www.drupal.org/project/pathauto/issues/3495869" title="Status: Closed (duplicate)">#3495869: Deprecations PHP 8.4</a></span></p>
<p>Lets update the variable so that it's easy to test that.</p>
<h4 id="summary-steps-reproduce">Steps to reproduce</h4>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<h3 id="summary-ui-changes">User interface changes</h3>
<h3 id="summary-api-changes">API changes</h3>
<h3 id="summary-data-model-changes">Data model changes</h3>
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