Update git submodules

* Update docs/submodules/releng from branch 'master'
  to e6189c9f5211c64bc0dc146ccf65762805969b33
  - Publish Functest K8s v1.27 and v1.28 jobs

    Change-Id: I7ca83b5bc5354c49bcd390a707e4787105f950b3
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 44ef29e..e6189c9 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 44ef29e2726764b61f1919e8fa20d75bb5d38778
+Subproject commit e6189c9f5211c64bc0dc146ccf65762805969b33