Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 0d088b8386b4916f7e6fdf47eaac7653d229b85e
  - Bug: Use py36 for Doctor tox

    Signed-off-by: Tomi Juvonen <tomi.juvonen@nokia.com>
    Change-Id: I5327b9a657110de8f126bd17b9749fdf9191da6a

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 5708597..0d088b8 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 5708597bc13fa29c27a8734c0102231200eaeea2
+Subproject commit 0d088b8386b4916f7e6fdf47eaac7653d229b85e