net/gitup: move ports to git.freebsd.org
Update gitup.conf to reflect that ports main and quarterly moved to git.freebsd.org
PR: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255032
Submitted by: tomblack <tomblackwhite@outlook.com>
Approved by: dbaio, garga (mentors)
Differential Revision: https://reviews.freebsd.org/D29767