Use a correct version of the CzechLight/dependencies repo

Now that these are no longer pinned via cla-sysrepo or netconf-cli, it's
possible to support taking a specific commit in two different ways:

- as a git submodule, i.e., whatever is in the repo, ignoring Zuul,
- or from Zuul's job dependencies, overriding whatever is pinned via the git submodule

In a way, this achieves a similar end result with what we're currently
doing for `velia`, `cla-sysrepo`, `netconf-cli` and `rousette` -- except
these are BR-level packages which map 1:1 to a git submodule, whereas
the `CzechLight/dependencies` is a magic snowflake which determines
versions of a zillion of other packages.

Fixes: 69c92de Fix git version reporting of `CzechLight/dependencies`
Fixes: 32ca34f Stop pinning `CzechLight/dependencies` via `cla-sysrepo` and `netconf-cli`
Change-Id: Iac701db50f5d349a053aa548c9ce4b960349e95a
Depends-on: https://gerrit.cesnet.cz/c/ci/zuul-jobs-cesnet/+/5618
diff --git a/.zuul.yaml b/.zuul.yaml
index 2462399..fb85f6b 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -6,6 +6,7 @@
     vars:
       prepare_git_submodules: true
       zuul_work_dir: "{{ zuul.projects[zuul.project.canonical_hostname + '/CzechLight/br2-external'].src_dir }}"
+      git_submodule_dirs: "{{ zuul.projects[zuul.project.canonical_hostname + '/CzechLight/br2-external'].src_dir }}:{{ zuul.projects[zuul.project.canonical_hostname + '/CzechLight/dependencies'].src_dir }}"
     required-projects: &projects
       - github/buildroot/buildroot
       - CzechLight/dependencies