Problem

We're on a version of jackson from October 2016, and it has a [CVE][0] against it.
Furthermore, there are bugfixes and feature improvements in new jackson, which
we would like to use.

Solution

Upgrade to the latest and greatest version of jackson.

[0]: https://nvd.nist.gov/vuln/detail/CVE-2017-7525

JIRA Issues: CSL-6599

Differential Revision: https://phabricator.twitter.biz/D204133