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/board/czechlight/common/os-release.sh b/board/czechlight/common/os-release.sh
index 06c65d1..6c4b4c2 100755
--- a/board/czechlight/common/os-release.sh
+++ b/board/czechlight/common/os-release.sh
@@ -11,11 +11,13 @@
 CLA_BR2_EXTERNAL_REV=$(czechlight_describe_git ${BR2_EXTERNAL_CZECHLIGHT_PATH})
 CLA_SYSREPO_REV=$(czechlight_describe_git $(czechlight_query_local_make_var CLA_SYSREPO_OVERRIDE_SRCDIR))
 NETCONF_CLI_REV=$(czechlight_describe_git $(czechlight_query_local_make_var NETCONF_CLI_OVERRIDE_SRCDIR))
-CLA_CPP_DEPENDENCIES_REV=$(czechlight_describe_git ${BR2_EXTERNAL_CZECHLIGHT_PATH}/submodules/dependencies)
 GAMMARUS_REV=$(czechlight_describe_git $(czechlight_query_local_make_var GAMMARUS_OVERRIDE_SRCDIR))
 VELIA_REV=$(czechlight_describe_git $(czechlight_query_local_make_var VELIA_OVERRIDE_SRCDIR))
 ROUSETTE_REV=$(czechlight_describe_git $(czechlight_query_local_make_var ROUSETTE_OVERRIDE_SRCDIR))
 
+# CzechLight/dependencies might come either from a git submodule, or from a Zuul change enqueued before this one
+CLA_CPP_DEPENDENCIES_REV=$(czechlight_describe_git $(czechlight_query_local_make_var LIBYANG_OVERRIDE_SRCDIR)/..)
+
 sed -i \
 	-e 's/^VERSION_ID=/BUILDROOT_VERSION_ID=/' \
 	-e 's/^VERSION=/BUILDROOT_VERSION=/' \