Add 3.3.0 announcement.

Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

Author: igsilya

_includes/side-widgets.html

@@ -4,6 +4,9 @@
   </div>
   <div class="widget-body">
     <ul>
+      <li>
+        <a href=https://mail.openvswitch.org/pipermail/ovs-announce/2024-February/000343.html>Feb 16 2024: Open vSwitch 3.3.0 is now Available</a>
+      </li>
       <li>
         <a href=https://mail.openvswitch.org/pipermail/ovs-announce/2024-February/000340.html>Feb 08 2024: [ADVISORY] CVE-2023-5366: OpenFlow match on Neighbor Discovery Target may be ignored</a>
       </li>
@@ -73,9 +76,6 @@
       <li>
         <a href=https://mail.openvswitch.org/pipermail/ovs-announce/2021-August/000277.html>Aug 16 2021: Open vSwitch 2.16.0 is Available</a>
       </li>
-      <li>
-        <a href=https://mail.openvswitch.org/pipermail/ovs-announce/2021-July/000276.html>Jul 01 2021: Open vSwitch 2.15.1 and 2.13.4 are available</a>
-      </li>
     </ul>
   </div>
 </div>