Bump xos libraries to version 4.0.0

Change-Id: I07891c1f308593cef9b0f456512630eb279cc94f
diff --git a/requirements.txt b/requirements.txt
index 4d3cfbd..68c5b17 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 kubernetes~=9.0.0
-xossynchronizer~=3.3.0
-xosapi~=3.0.1
-xoskafka~=3.0.1
+xossynchronizer~=4.0.0
+xosapi~=4.0.0
+xoskafka~=4.0.0
 kafkaloghandler~=0.9.0