Fix build with boost 1.84

Index: OrthancServer/Sources/ServerToolbox.h
--- OrthancServer/Sources/ServerToolbox.h.orig
+++ OrthancServer/Sources/ServerToolbox.h
@@ -27,6 +27,7 @@
 #include "ServerEnumerations.h"
 
 #include <boost/noncopyable.hpp>
+#include <cassert>
 #include <list>
 
 namespace Orthanc
