We started to version them last cycle, so docs can be differentiated
between versions. It is not *expected* that two versions show up
on the same system, but then it also doesn't hurt handling it.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2822>
Once environment.js is an ES module we need to ensure we can dynamically
specify the version for required GI dependencies such as Clutter.
Moving dependency version setup to dependencies.js ensures gi.require
calls are done before environment.js imports any utilities.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2822>