DEPEND in gitlab ebuilds

According to https://github.com/gitlabhq/gitlabhq/blob/master/doc/update/upgrading_from_source.md some dependencies should be more specific.

In the gitlabhq ebuild:

DEPEND="${GEMS_DEPEND}
 	>=dev-lang/ruby-2.5[ssl]
        ...
	>=net-libs/nodejs-8.10.0
        ..."

In the gitlab-workhorse ebuild:

DEPEND=">=dev-lang/go-1.10.0"

In the gitlab-gitaly ebuild:

DEPEND=">=dev-lang/go-1.10.0
        ..."

Just for the sake of completeness, as normal updates already installed the required versions of all dependencies.