[SYS] Remove handleJsonQueue wrapper and use std::string (#2038)

Co-authored-by: Florian <1technophile@users.noreply.github.com>

main/ZsensorGPIOInput.ino

@@ -92,7 +92,7 @@ void MeasureGPIOInput() {
         GPIOdata["gpio"] = "LOW";
       }
       GPIOdata["origin"] = subjectGPIOInputtoMQTT;
-      handleJsonEnqueue(GPIOdata);
+      enqueueJsonObject(GPIOdata);
 
 #  if defined(ZactuatorONOFF) && defined(ACTUATOR_TRIGGER)
       //Trigger the actuator if we are not at startup