Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 823d51514b5f5e4780fa084d570eccb8eb445fff
  - Automation adds kuberef.yaml

    Change-Id: Ic9258a39e06cb2af10eecae544d205583858d85c
    Signed-off-by: lf-jobbuilder <releng+lf-jobbuilder@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 9ac70a3..823d515 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 9ac70a3a0d3af05cebf7c56133625481cbbe076c
+Subproject commit 823d51514b5f5e4780fa084d570eccb8eb445fff