Update git submodules

* Update docs/submodules/apex from branch 'stable/danube'
  - Merge "Fix rdo-release for newton" into stable/danube
  - Fix rdo-release for newton

    Change-Id: I96e38561c9d9e401042ba4ab7785801993d8a720
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index c454fca..652d97b 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit c454fcae3b18b4a31b57cd4d843844241a9c6cdf
+Subproject commit 652d97b4808ae3cd31a7440d59bc50cb0a157143