update nlohmann::json to v3.11.1

external/json/include/nlohmann/detail/meta/is_sax.hpp

@@ -1,16 +1,25 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++
+// |  |  |__   |  |  | | | |  version 3.11.1
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
 #pragma once
 
 #include <cstdint> // size_t
 #include <utility> // declval
 #include <string> // string
 
+#include <nlohmann/detail/abi_macros.hpp>
 #include <nlohmann/detail/meta/detected.hpp>
 #include <nlohmann/detail/meta/type_traits.hpp>
 
-namespace nlohmann
-{
+NLOHMANN_JSON_NAMESPACE_BEGIN
 namespace detail
 {
+
 template<typename T>
 using null_function_t = decltype(std::declval<T&>().null());
 
@@ -145,5 +154,6 @@ struct is_sax_static_asserts
         "Missing/invalid function: bool parse_error(std::size_t, const "
         "std::string&, const exception&)");
 };
+
 }  // namespace detail
-}  // namespace nlohmann
+NLOHMANN_JSON_NAMESPACE_END