chore: add IWYU pragma: keep for AttributeInstanceHandle.h

Author: ShrBox

src/legacy/api/PlayerAPI.cpp

@@ -88,7 +88,7 @@
 #include "mc/world/attribute/Attribute.h"
 #include "mc/world/attribute/AttributeInstance.h"
 #include "mc/world/attribute/AttributeInstanceConstRef.h"
-#include "mc/world/attribute/AttributeInstanceHandle.h"
+#include "mc/world/attribute/AttributeInstanceHandle.h" // IWYU pragma: keep
 #include "mc/world/attribute/AttributeInstanceRef.h"
 #include "mc/world/attribute/SharedAttributes.h"
 #include "mc/world/effect/EffectDuration.h"