Added 2nd Orekit talk to publications page.

publications.html

@@ -27,6 +27,11 @@ layout: default_orekit
       Bryan Cazabonne (Airbus Defence and Space)<br/>
       May 23rd 2023</p>
   </li>
+  <li>
+    <p><span class="fa-li fa-lg fa fa-gears"></span><a href="https://orekit.org/news/2023/09/26/2nd-orekit-talk-Propagating_Uncertainties-Florian-Humeau.html">Second Orekit Talk: Propagating Uncertainties - New methods of Uncertainties Propagation with Orekit</a><br/>
+      Florian Humeau (CS Group)<br/>
+      September 21st 2023</p>
+  </li>
 </ul>
 
 <h1>Technical Notes</h1>