Release openonu-py adapter chart version 2.4.6

Change-Id: Id73a0823289c67afb4bcf117aa327f44d03c0b28
diff --git a/voltha-adapter-openonu/values.yaml b/voltha-adapter-openonu/values.yaml
index 7a3a8e1..2de326d 100644
--- a/voltha-adapter-openonu/values.yaml
+++ b/voltha-adapter-openonu/values.yaml
@@ -64,7 +64,7 @@
   adapter_open_onu:
     registry: '{{ .Values.defaults.image_registry }}'
     repository: '{{ .Values.defaults.image_org }}voltha-openonu-adapter'
-    tag: '{{- if hasKey .Values.defaults "image_tag" }}{{- if .Values.defaults.image_tag }}{{ .Values.defaults.image_tag }}{{- else }}2.4.7{{- end }}{{- else }}2.4.7{{- end }}'
+    tag: '{{- if hasKey .Values.defaults "image_tag" }}{{- if .Values.defaults.image_tag }}{{ .Values.defaults.image_tag }}{{- else }}2.4.8{{- end }}{{- else }}2.4.8{{- end }}'
     pullPolicy: '{{ .Values.defaults.image_pullPolicy }}'
   adapter_open_onu_go:
     repository: '{{ .Values.defaults.image_org }}voltha-openonu-adapter-go'