Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Apex: fixes groovy script

    The script had double quotes which will try to interpret dollar sign as
    a templated variable.  Switching to literal string.

    Change-Id: Ic8d09dc6c862b9db95bf9d1277f562e5bce02fc9
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 99178e1..af3d0f6 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 99178e18ab050714db02f1a6bdcf337a21727fe0
+Subproject commit af3d0f65484c7ad99f716dae0adcf9b2044bee05