fix: update json include paths to use local header

Author: l3utterfly

common/chat-template.hpp

@@ -9,7 +9,7 @@
 #pragma once
 
 #include "minja.hpp"
-#include <json.hpp>
+#include "json.hpp"
 #include <string>
 #include <vector>
 

common/chat.hpp

@@ -3,7 +3,7 @@
 #pragma once
 
 #include "common.h"
-#include <json.hpp>
+#include "json.hpp"
 #include <optional>
 #include <string>
 #include <vector>

common/minja.hpp

@@ -16,7 +16,7 @@
 #include <stdexcept>
 #include <sstream>
 #include <unordered_set>
-#include <json.hpp>
+#include "json.hpp"
 
 using json = nlohmann::ordered_json;