www/gitlab-ce: Major upgrade to 14.0.0.
Make sure you upgrade first to 13.12.2, otherwise you will lose your
advanced search index.
Upgrade instructions as usual:
https://gitlab.fechner.net/mfechner/Gitlab-docu/-/blob/master/update/13.12-14.0-freebsd.md
Changelog:
https://about.gitlab.com/releases/2021/06/22/gitlab-14-0-released/