Fix build with boost 1.84

Index: OrthancServer/Sources/Search/ISqlLookupFormatter.cpp
--- OrthancServer/Sources/Search/ISqlLookupFormatter.cpp.orig
+++ OrthancServer/Sources/Search/ISqlLookupFormatter.cpp
@@ -39,7 +39,7 @@
 #include "DatabaseConstraint.h"
 
 #include <boost/lexical_cast.hpp>
-
+#include <cassert>
 
 namespace Orthanc
 {
