Update banner link

Author: Seldaek

templates/layout.html.twig

@@ -47,7 +47,7 @@
         <header class="navbar-wrapper navbar-fixed-top">
             {% if 'now'|date('Ymd') < '20251001' %}
             <section class="banner alert-error hidden">
-                Composer v1 support is <a href="https://blog.packagist.com/shutting-down-packagist-org-support-for-composer-1-x/">coming to an end</a>
+                Composer v1 support is <a href="https://blog.packagist.com/packagist-org-shutdown-of-composer-1-x-support-postponed-to-september-1st-2025/">coming to an end</a>
                 <i class="glyphicon glyphicon-remove banner-close" data-banner-id="composer1eol"></i>
             </section>
             {% endif %}