[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.

wpiutil/src/main/native/include/wpi/array.h

@@ -5,12 +5,11 @@
 #pragma once
 
 #include <array>
+#include <concepts>
 #include <cstddef>
 #include <tuple>
 #include <utility>
 
-#include "wpi/concepts.h"
-
 namespace wpi {
 
 struct empty_array_t {};