Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 93928495947d2463bc0bc19ca85592513271f011
  - Temporarily disable arm64 docker builds

    No arm64 build servers are reachable.
    It blocks both archs.

    Change-Id: Ic6560a5e58ce60dbf318e8ab5711a29ed2c7936a
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 4748a7a..9392849 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 4748a7aa71da856310afd78e675a7d59db0111c0
+Subproject commit 93928495947d2463bc0bc19ca85592513271f011