ntp: 4.2.8p12 -> 4.2.8p13 (#57059)
From http://www.ntp.org/index.html:
> ntp-4.2.8p13 was released on 07 March 2019.
> It addresses 1 medium-severity security issue in ntpd, and provides 17
> other non-security fixes and 1 improvements over 4.2.8p12.
(cherry picked from commit d7c23cc65f94692146d5e387976a360bfbc445dd)
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