Restore URL-based links on requirements files

Change-Id: I230e0484c29a62add870ff57ad520c798fd3a23f
diff --git a/workflows/att-workflow/requirements.yaml b/workflows/att-workflow/requirements.yaml
index 6f6e0da..95a86a9 100644
--- a/workflows/att-workflow/requirements.yaml
+++ b/workflows/att-workflow/requirements.yaml
@@ -16,4 +16,4 @@
 dependencies:
 - name: att-workflow-driver
   version: 2.0.0
-  repository: file://../../xos-services/att-workflow-driver
+  repository: https://charts.opencord.org