update ArduinoJson

lib/ArduinoJson/CHANGELOG.md

@@ -4,6 +4,12 @@ ArduinoJson: change log
 HEAD
 ----
 
+* Drop support for C++98/C++03. Minimum required is C++11.
+* Remove `ARDUINOJSON_NAMESPACE`; use `ArduinoJson` instead.
+
+v6.20.1 (2023-02-08)
+-------
+
 * Remove explicit exclusion of `as<char*>()` and `as<char>()` (issue #1860)
   If you try to call them, you'll now get the same error message as any unsupported type.
   You could also add a custom converter for `char*` and `char`.