Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 5270df2d68de8b0469ed2b2e4e600e0d2d67ef96
  - Switch from docker scan to grype

    Docker scan allows only 10 runs per months in LFN conditions.

    Change-Id: I7b28ffa13946423c610e2bb2b83b5b8f79da3a6e
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d690ac4..5270df2 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d690ac4926c91c207740de3c91823fd5139f05e8
+Subproject commit 5270df2d68de8b0469ed2b2e4e600e0d2d67ef96