Update git submodules

* Update docs/submodules/sdc/sdc-docker-base.git from branch 'master'
  to 42783072f49b10565a54a73f81619dfd9066fc69
  - Bump Base dockers version to 1.6.0
    
    Bump Base Cassandra version to 1.6.0
    Issue-ID: SDC-2595
    
    Signed-off-by: shrek2000 <oren.kleks@amdocs.com>
    Change-Id: Ie7f13a081d6236f1a1fc561dcd1651591d412013
    Signed-off-by: shrek2000 <oren.kleks@amdocs.com>
    
diff --git a/docs/submodules/sdc/sdc-docker-base.git b/docs/submodules/sdc/sdc-docker-base.git
index 3beba9c..4278307 160000
--- a/docs/submodules/sdc/sdc-docker-base.git
+++ b/docs/submodules/sdc/sdc-docker-base.git
@@ -1 +1 @@
-Subproject commit 3beba9ce870b43ad094fed5c5ac9c9987bf488e7
+Subproject commit 42783072f49b10565a54a73f81619dfd9066fc69