Fix build with boost 1.91

Index: src/mongo/bson/util/builder.h
--- src/mongo/bson/util/builder.h.orig
+++ src/mongo/bson/util/builder.h
@@ -39,6 +39,7 @@
 #include <type_traits>
 
 #include <boost/optional.hpp>
+#include <boost/static_assert.hpp>
 
 #include "mongo/base/data_type_endian.h"
 #include "mongo/base/data_view.h"
