Bump CORE_PHP_MAX to 8.5 and CORE_PHP_NEXT to 8.6
>>> [!note] Migrated issue
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Reported by: [mondrake](https://www.drupal.org/user/1307444)
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<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p><a href="https://drupal.slack.com/archives/CGKLP028K/p1767812080472489">https://drupal.slack.com/archives/CGKLP028K/p1767812080472489</a></p>
<blockquote><p> IMO max should be 8.5 right now (it’s GA since Nov 2025), next should be 8.6. </p></blockquote>
<p>Probably an 8.6 image is not available yet, I think for the time being CORE_PHP_NEXT could stay on PHP 8.5 until an image is available.</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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