Review usage of the XMLGregorianCalendarAdapter in java above 8

[zubri]

https://stackoverflow.com/questions/71489410/prowide-library-exception-while-processing-iso-20022-messages-with-dates/71506567?noredirect=1#comment129756874_71506567

We do have a custom Json serializer for the XMLGregorianCalendar and we configure it in the Gson calls. However, according to the post, Gson is not picking it up in the toJson serialization.