Update git submodules

* Update docs/submodules/releng from branch 'master'
  to a4b164d8b10be199627d9e5e913b190f0e7d98b2
  - community.docker must be updated if RockyLinux 9 now

    https://github.com/collivier/ansible-role-xtesting/commit/797824dbcb0783f12ec513bc441cd3bd5667b01c

    Change-Id: If19bbea99ae5c0649773ecada9b11b38b1807591
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 0d0a9dd..a4b164d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 0d0a9dd2b5d026da7bfa149eb015e77a9da3ddf9
+Subproject commit a4b164d8b10be199627d9e5e913b190f0e7d98b2