tests : remove json.hpp from a test (ggml-org#13880)

ggml-ci

Author: ggerganov

tests/test-chat-parser.cpp

@@ -7,16 +7,13 @@
 //
 #include <exception>
 #include <iostream>
-#include <json.hpp>
 #include <string>
 
 #include "chat-parser.h"
 #include "common.h"
 #include "log.h"
 #include "regex-partial.h"
 
-using json = nlohmann::ordered_json;
-
 template <class T>
 static void assert_equals(const T & expected, const T & actual) {
     if (expected != actual) {