test: cleanup

test/entt/entity/sigh_mixin.cpp

@@ -4,7 +4,6 @@
 #include <type_traits>
 #include <utility>
 #include <gtest/gtest.h>
-#include <entt/core/any.hpp>
 #include <entt/core/type_info.hpp>
 #include <entt/entity/component.hpp>
 #include <entt/entity/entity.hpp>