Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 9a4060a375de4afadab75574fd14345756bfcd24
  - Publish new Xtesting 2023.2 jobs

    Change-Id: Ifadb897109bc4d271423cd459592acacf13474e0
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 0ce746d..9a4060a 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 0ce746d726073145a9c623a4cc2d922b07e2f5e6
+Subproject commit 9a4060a375de4afadab75574fd14345756bfcd24