sysutils/py-salt: Update to 2019.2.3

Changes this release:

https://docs.saltstack.com/en/latest/topics/releases/2019.2.3.html

PR: 243908
Submitted by: Christer Edwards <christer.edwards@gmail.com> (maintainer)
Approved by: Christer Edwards <christer.edwards@gmail.com> (maintainer)
Security: CVE-2019-17361