Update JuMP-dev 2024 schedule

Author: mlubin

_includes/jump-dev-2024-schedule.html

@@ -151,7 +151,7 @@
 </tr>
 <tr>
   <td class="talk-table">14:15&nbsp;</td>
-  <td class="talk-table talk-break"></td>
+  <td class="talk-table"><div class="talk-title">Solving Difficult Reachability Problems in JuMP.jl</div><div class="talk-speaker">Chelsea Sidrane</div></td>
   <td class="talk-table talk-break"></td>
   <td class="talk-table talk-organization"></td>
 </tr>