Update mapfile separator :: (new syntax)

In Mapfile, the syntax : is deprecated as of v1.4.3 and will be removed in future versions. Map file configurations should use the new syntax ie. ::

Author: zillani

deploy/install.yaml

@@ -208,7 +208,7 @@ metadata:
 apiVersion: v1
 data:
   maps: |
-    default:registry.example.com
+    default::registry.example.com
 kind: ConfigMap
 metadata:
   creationTimestamp: null