[wpiutil] Fix deprecation warning in LLVM for C++23 (#5642)

wpiutil/src/main/native/thirdparty/llvm/include/wpi/FunctionExtras.h

@@ -37,6 +37,7 @@
 #include "wpi/STLForwardCompat.h"
 #include "wpi/MemAlloc.h"
 #include "wpi/type_traits.h"
+#include <cstddef>
 #include <cstring>
 #include <memory>
 #include <type_traits>
@@ -167,8 +168,7 @@ protected:
     // provide four pointers worth of storage here.
     // This is mutable as an inlined `const unique_function<void() const>` may
     // still modify its own mutable members.
-    mutable std::aligned_storage_t<InlineStorageSize, alignof(void *)>
-        InlineStorage;
+    alignas(void*) mutable std::byte InlineStorage[InlineStorageSize];
   } StorageUnion;
 
   // A compressed pointer to either our dispatching callback or our table of