Using latest release of openonu-go in the helm charts

Change-Id: I972045b18fa7c8f2fceef7226a4edaffee2d91bd
diff --git a/voltha-stack/Chart.yaml b/voltha-stack/Chart.yaml
index 2a09ded..2bb24e1 100644
--- a/voltha-stack/Chart.yaml
+++ b/voltha-stack/Chart.yaml
@@ -28,7 +28,7 @@
 name: voltha-stack
 
 appVersion: "2.8"
-version: 2.8.3
+version: 2.8.4
 
 dependencies:
   - name: voltha
@@ -37,7 +37,7 @@
     condition: voltha.enabled
   - name: voltha-adapter-openonu
     repository: file://../voltha-adapter-openonu
-    version: 2.8.8
+    version: 2.8.9
     condition: voltha-adapter-openonu.enabled
   - name: voltha-adapter-openolt
     repository: file://../voltha-adapter-openolt