Fix build issues for masOS Sonoma 14.4

The latest macOS update seems to have moved AuthorizationRef, so add the
extra include to allow it to build properly.

Framework/Kernel/src/NetworkProxyOSX.cpp

@@ -10,9 +10,9 @@
 #include "MantidKernel/NetworkProxy.h"
 #include <CFNetwork/CFProxySupport.h>
 #include <CoreFoundation/CoreFoundation.h>
+#include <Security/Authorization.h>
 #include <SystemConfiguration/SystemConfiguration.h>
 #include <sstream>
-#include <string>
 #include <vector>
 
 namespace Mantid {