SEBA-465 many2many should not have null= set

Change-Id: I6293e768cfc32bfbbec4fe29a27f1d0ee21fb344
diff --git a/containers/chameleon/Dockerfile.chameleon b/containers/chameleon/Dockerfile.chameleon
index 37753b0..2e7c9cb 100644
--- a/containers/chameleon/Dockerfile.chameleon
+++ b/containers/chameleon/Dockerfile.chameleon
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # xosproject/chameleon
-FROM xosproject/xos-base:2.1.42
+FROM xosproject/xos-base:2.1.43
 
 # xos-base already has protoc and dependencies installed