update 3.12 release date in web news

index.html

@@ -245,7 +245,7 @@ least one, it may help you to get a first idea of what GF is.
   <div class="col-md-6">
     <h2>News</h2>
     <dl class="row">
-      <dt class="col-sm-3 text-center text-nowrap">2025-08-03</dt>
+      <dt class="col-sm-3 text-center text-nowrap">2025-08-08</dt>
       <dd class="col-sm-9">
         <strong>GF 3.12 released.</strong>
         <a href="download/release-3.12.html">Release notes</a>