Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 4e48b496ded4759ea201c433846f2854e9e4d8a5
  - Prepare Zed releases

    Change-Id: I22bc4bd0bfa92aa1871dd3b3e35b68b99bb4b3f0
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 9a166bf..4e48b49 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 9a166bff6f9831f0337d5e80fe1280977926686c
+Subproject commit 4e48b496ded4759ea201c433846f2854e9e4d8a5