Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Temporarily stop building arm64 containers

    They cannot be built due to the issues on arm build pods.
    It allows applying patches in Functest before the release.

    Change-Id: I6e008867c8e75fc71f570bc6539f9ccef8c84fd9
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index bc76b19..e1698c2 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit bc76b199250b9edd26197b216e44a9e4fc618043
+Subproject commit e1698c2c7f45e42c18b9ef75bcc0f5b896bd5de6