sysutils/monit: Update to 5.27.1

Bug fix release with several fixes, now using the ISO 8601 format timestamp in log files[1].

[1] https://mmonit.com/monit/changes/

PR: 250583
Submitted by: Martin Pala <martinp@tildeslash.com> (maintainer)
Approved by: arrowd (mentor)
Differential Revision: https://reviews.freebsd.org/D26940