Update include/pybind11/pybind11.h

Author: henryiii

include/pybind11/pybind11.h

@@ -1967,7 +1967,7 @@ struct iterator_state {
 
 // Note: these helpers take the iterator by non-const reference because some
 // iterators in the wild can't be dereferenced when const. C++ needs the extra parens in decltype.
-template <typename Iterator, typename ResultType = decltype((*std::declval<Iterator>()))>
+template <typename Iterator, typename ResultType = decltype(*std::declval<Iterator>())>
 struct iterator_access {
     using result_type = ResultType;
     // NOLINTNEXTLINE(readability-const-return-type) // PR #3263