Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 06d789d077610e317f8637fce2882db956752566
  - If releng verification had worked (x2)

    Verification has failed for years due to incomplete lock cache.

    Change-Id: I0b6d40636acf5b71457aab64cd7e6f5fa7cb45b4
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index c51c46c..06d789d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit c51c46c686895b20058c4de9fc961f1dcf14fba9
+Subproject commit 06d789d077610e317f8637fce2882db956752566