THORN-2430: Upgrade Jackson dependency to 2.9.9
THORN-2430: Upgrade Jackson dependency to 2.9.9

Motivation
----------
Our Jackson version is very old.

Modifications
-------------
Upgrade Jackson to latest version.

One notable thing: WildFly 15.0.1.Final, on which Thorntail
is currently based, uses the same old Jackson version.
But we already configure the global `module-rewrite.conf`
to override all Jackson modules to our selected version,
so the old version shouldn't appear anywhere.

Result
------
More up to date Jackson.

wildfly-swarm/wildfly-swarm-core,wildfly-swarm/wildfly-swarm,wildfly-swarm/wildfly-swarm,wildfly-swarm/wildfly-swarm,wildfly-swarm/wildfly-swarm,wildfly-swarm/wildfly-swarm-core,wildfly-swarm/wildfly-swarm,wildfly-swarm/wildfly-swarm-core,wildfly-swarm/wildfly-swarm-core,wildfly-swarm/wildfly-swarm-core