Update git submodules

* Update docs/submodules/apex from branch 'stable/gambia'
  - Downgrade ceph-ansible package

    Ceph Ansible is failing deployments with:
    https://bugzilla.redhat.com/show_bug.cgi?id=1644713

    Change-Id: I4e1cad9330f77472e52b5d790b008e9d238cc48e
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 29f6d15..8a62fa4 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 29f6d15e5d89cde21b06d190d3253796ff05f3e5
+Subproject commit 8a62fa436cac07cda2cac228d7df54893045d91f