vdd24: update register url

www.videolan.org/videolan/events/vdd24/index.php

@@ -96,7 +96,7 @@
     <hr class="spacer-2">
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       <div class="col">
-	Register for free at <a href="https://framaforms.org/vdd-2024-1723106137" target="_new">VDD 24 registration form</a>
+	Register for free at <a href="https://framaforms.org/vdd-2024-1729234952" target="_new">VDD 24 registration form</a>
       </div>
     </div>
   </div>