fix(type_traits): is_template_instance<>

add Args... in true_type specialization

gblibstdc++/include/type_traits

@@ -212,7 +212,7 @@ template <typename U, template <typename...> class T, typename...>
 struct is_template_instance : public false_type {
 };
 template <template <typename...> class T, typename... Ts>
-struct is_template_instance<T<Ts...>, T> : public true_type {
+struct is_template_instance<T<Ts...>, T, Ts...> : public true_type {
 };
 
 template <typename U, template <typename...> class T, typename... Ts>