SEBA-536 Update xos-core helm chart to use xos-core 3.0.0 and related services

Change-Id: I0069b72e5c4cabc26940e5fdd9ee73f9da661fad
diff --git a/workflows/att-workflow/requirements.yaml b/workflows/att-workflow/requirements.yaml
index d907822..9aca671 100644
--- a/workflows/att-workflow/requirements.yaml
+++ b/workflows/att-workflow/requirements.yaml
@@ -15,5 +15,5 @@
 
 dependencies:
 - name: att-workflow-driver
-  version: 1.0.19
+  version: 1.0.20
   repository: file://../../xos-services/att-workflow-driver