Update git submodules

* Update kubernetes/aai from branch 'master'
  to b31e250091cd68edb77f3158691844decda82fc8
  - [aai-oom] Bump versions for babel and schema-service
    
    Signed-off-by: efiacor <fiachra.corcoran@est.tech>
    Issue-ID: AAI-3099
    Change-Id: Id6ebb67f39ed6f4b3dc24d1ef1447b1f272037a0
    
diff --git a/kubernetes/aai b/kubernetes/aai
index 7e6e2bf..b31e250 160000
--- a/kubernetes/aai
+++ b/kubernetes/aai
@@ -1 +1 @@
-Subproject commit 7e6e2bf385f85e85e008d06b2415290851fee2b7
+Subproject commit b31e250091cd68edb77f3158691844decda82fc8