Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Backport of Congress parallel execution"
  - Backport of Congress parallel execution

    JIRA: APEX-480
    JIRA: DOCTOR-78

    Change-Id: I6b5b3e7f2daaec7e2ead76d74f8d3713378a5200
    Signed-off-by: Carlos Goncalves <carlos.goncalves@neclab.eu>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 6bfab6c..0bf4a8d 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 6bfab6c7e79ed029a9102ff7b7955b0a71f13c6d
+Subproject commit 0bf4a8d12a5eb2be0c2767370347109309c2a06e