Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Apex: fix apex upload for images

    Change-Id: Ibff76b1ce7cb4e071e576fd111bfff8af2cc2021
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 02443d9..04a31c0 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 02443d937d4a26e7abb22c10e6d5670895291cf2
+Subproject commit 04a31c06280769d1a209affa78839c48d850a434