Update git submodules

* Update docs/submodules/policy/apex-pdp.git from branch 'master'
  to 20b67a6e8cd07b7e49a7725288d95fb66dcebae0
  - Fix Kafka partiion support in APEX

    The kafka producer property ‘partitioner.class’ should be configurable via
    the EngineConfig.json file so that a specialized or custom Kafka partitioner
    can be used.

    Issue-ID: POLICY-1627
    Change-Id: Ic36ccdf3d244ab932b58c3e2ae1cd668249726c5
    Signed-off-by: liamfallon <liam.fallon@est.tech>

diff --git a/docs/submodules/policy/apex-pdp.git b/docs/submodules/policy/apex-pdp.git
index f2f9e5e..20b67a6 160000 (submodule)
--- a/docs/submodules/policy/apex-pdp.git
+++ b/docs/submodules/policy/apex-pdp.git
@@ -1 +1 @@
-Subproject commit f2f9e5e8c4ce5c3ff75cbe6f6f4e2de5e4b3f3fb
+Subproject commit 20b67a6e8cd07b7e49a7725288d95fb66dcebae0