Update to ArduinoJson 7.0.4

lib/ArduinoJson/extras/tests/Misc/Utf8.cpp

@@ -1,5 +1,5 @@
 // ArduinoJson - https://arduinojson.org
-// Copyright © 2014-2023, Benoit BLANCHON
+// Copyright © 2014-2024, Benoit BLANCHON
 // MIT License
 
 #include <ArduinoJson.h>
@@ -10,9 +10,8 @@
 using namespace ArduinoJson::detail;
 
 static void testCodepoint(uint32_t codepoint, std::string expected) {
-  char buffer[4096];
-  MemoryPool pool(buffer, 4096);
-  StringCopier str(&pool);
+  ResourceManager resources;
+  StringBuilder str(&resources);
   str.startString();
 
   CAPTURE(codepoint);