Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Apex: fixes build directory assumption in upload artifact

    Change-Id: Iae230e37137b0408a74ba74bd551a88dd6ffa076
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index c6222bd..3579f85 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit c6222bda887a22bf40e7c062b727d33b24e1f1e8
+Subproject commit 3579f85c1d3400c5ce72a27453621304f83fdc70