Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Update recipient list for arm jobs"
  - Update recipient list for arm jobs

    Change-Id: Ic40f950bfb5505c95a16edb2e71017a9edb87db2
    Signed-off-by: Cristina Pauna <cristina.pauna@enea.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 2ad4217..4669639 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 2ad42172afe06e06a32d6fa1c24e6106e5997eaf
+Subproject commit 4669639e5076d617b4792aacd66a568ce6912449