Bump openolt adapter chart version to 2.3.1 for voltha-2.3 release
diff --git a/releases/voltha-2.3 b/releases/voltha-2.3
index 7ef2385..20e2978 100644
--- a/releases/voltha-2.3
+++ b/releases/voltha-2.3
@@ -2,7 +2,7 @@
 
 export VOLTHA_CHART_VERSION=2.3.1
 export VOLTHA_BBSIM_CHART_VERSION=3.0.18
-export VOLTHA_ADAPTER_OPEN_OLT_CHART_VERSION=2.3.0
+export VOLTHA_ADAPTER_OPEN_OLT_CHART_VERSION=2.3.1
 export VOLTHA_ADAPTER_OPEN_ONU_CHART_VERSION=2.3.0
 export ONOS_CHART_VERSION=3.0.1