[wpiutil] Upgrade to macOS 12 to remove concept shims (#5379)

The macOS deployment target has been upgraded from 10.15 to 11. Also, a
deprecation warning for sprintf() in libuv was suppressed.

glass/src/lib/native/cpp/Storage.cpp

@@ -4,9 +4,10 @@
 
 #include "glass/Storage.h"
 
+#include <concepts>
+
 #include <imgui.h>
 #include <wpi/StringExtras.h>
-#include <wpi/concepts.h>
 #include <wpi/json.h>
 
 using namespace glass;