Update git submodules

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

    This reverts commit e1698c2c7f45e42c18b9ef75bcc0f5b896bd5de6.

    Change-Id: Id1da3d52f283a27a28d26ea99e6d7ba13e9ea9d9
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 1a28b61..3b5bd36 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 1a28b61ccb46ee45dfee6e38fa29aff5c76cb69c
+Subproject commit 3b5bd364379fba7259455d16cb74ac5c394763bb