fix redis v4 in default values since we use config file directives that

aren't in 3.x

values.yaml

@@ -5,13 +5,13 @@ app:
 
 redis:
   repository: redis
-  tag: latest
+  tag: 4
   pullPolicy: Always
   resources: {}
 
 sentinel:
   repository: redis
-  tag: latest
+  tag: 4
   pullPolicy: Always
   resources: {}