Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Update Yamllint Version"
  - Update Yamllint Version

    1.6.0 is quite a bit out of date; Updating Yamllint to 1.8.2 will enable
    some nicer feature of yamllint (like single line rule disables).

    Change-Id: I88d1c14539516ccef4f5e2e7e95b0017503dd98f
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 09c625e..a56fe00 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 09c625e78efe5265aa21ee93cfc50d53d477ea5c
+Subproject commit a56fe00d0d5c962de8034b15c24b3d8310ed195e