Update git submodules

* Update docs/submodules/releng from branch 'master'
  to b69688936e28487ff72adedbe55181cb5d105223
  - Update Jenkins agent to 3283

    Change-Id: Ia06b2435371ae74d93bb66f53dd1d5ea5d931b23
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index cf8eb1f..b696889 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit cf8eb1fc02d4c7fdf74813c55ab466481f3ddf23
+Subproject commit b69688936e28487ff72adedbe55181cb5d105223