Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 4dde8d957248be0cc77abfa0af770762cee6960a
  - Adding parameters to kuberef verify job

    Adding missing parameters to kuberef verify jobs. In particular, the
    SLAVE_LABEL parameter is missing, preventing scheduling of jobs to
    jenkins slaves.

    Signed-off-by: Georg Kunz <georg.kunz@est.tech>
    Change-Id: I8cd80930c668451e8b48a4ae84ae240f756d2cbb

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 21c6560..4dde8d9 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 21c6560c28956387aa66ad07f30297f4e629ab7a
+Subproject commit 4dde8d957248be0cc77abfa0af770762cee6960a