Removing Jackson 1 support from UAA

Filip Hanik

The UAA team is currently upgrading Spring Framework dependencies in order
to stay up to date and be able to receive security and feature updates

With the story

the spring framework has dropped support for Jackson 1
We have decided to follow the same path, rather than increasing our testing
matrix and try to be backwards compatible,.

With this upgrade, we instead will be supporting Jackson 2,
directly from our classes.

While we attempt to be backwards compatible in most of our upgrade
scenarios, this one was instance we decided against it since Jackson 1 has
not had any software releases since 2013, and we most likely can't expect
any fixes against this library.

Feel free to ask any questions or raise any concerns. As a result, next UAA
release will be bumped to 2.3.x


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