Compilation error: DynamicJsonBuffer is a class from ArduinoJson 5

[Lieta2]

.../MHI-ESP2MQTT.ino:132:11: error: DynamicJsonBuffer is a class from ArduinoJson 5. Please see https://arduinojson.org/v7/upgrade-from-v5/ to learn how to upgrade to ArduinoJson 7
  132 |               DynamicJsonBuffer jsonBuffer;
      |           ^   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~                                                                                                                  
.../MHI-ESP2MQTT.ino:308:11: error: DynamicJsonBuffer is a class from ArduinoJson 5. Please see https://arduinojson.org/v7/upgrade-from-v5/ to learn how to upgrade to ArduinoJson 7
  308 |       DynamicJsonBuffer jsonBuffer;
      |           ^~~~~~~~~~~~~~~~~~~~~~~~~                                                                                                                          

exit status 1

Compilation error: DynamicJsonBuffer is a class from ArduinoJson 5. Please see https://arduinojson.org/v7/upgrade-from-v5/ to learn how to upgrade to ArduinoJson 7

[Lieta2]

This fixes compile errors