Update ArduinoJson6 to current 6.x release #2795
Merged
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ArduinoJson is currently at v7 but there are many breaking changes to consider so would require a new library.
This PR updates v6 to the latest release:
Was v6.15.2, released15/5/20
v6.21.3 released 23/7/23
Now v6.x, released 6/11/23
FlashString (FSTR::String) support has been simplified, and includes a couple of minor patches to ArduinoJson. This ensures FlashString objects are always passed by reference.