Use openonu-py adapter chart version 2.4.4 for voltha-2.4 releas

Change-Id: I5f340a59e10b180938e563825f3e1f782dd58046
diff --git a/releases/voltha-2.4 b/releases/voltha-2.4
index 1436ec8..44771e4 100644
--- a/releases/voltha-2.4
+++ b/releases/voltha-2.4
@@ -6,7 +6,7 @@
 export VOLTHA_CHART_VERSION=2.5.4
 export VOLTHA_BBSIM_CHART_VERSION=3.0.29
 export VOLTHA_ADAPTER_OPEN_OLT_CHART_VERSION=2.5.5
-export VOLTHA_ADAPTER_OPEN_ONU_CHART_VERSION=2.4.3
+export VOLTHA_ADAPTER_OPEN_ONU_CHART_VERSION=2.4.4
 export ONOS_CLASSIC_CHART_VERSION=0.1.1
 export RADIUS_CHART_VERSION=1.0.0
 export VOLTCTL_VERSION=1.1.8