SEBA-772 Update chart to use kafka-topic-exporter 1.2.3

Change-Id: I566bb048a3beddbd7c71becb245fd6fcc4db3747
diff --git a/nem-monitoring/values.yaml b/nem-monitoring/values.yaml
index 8d237f7..884fa94 100644
--- a/nem-monitoring/values.yaml
+++ b/nem-monitoring/values.yaml
@@ -19,7 +19,7 @@
 images:
   voltha_kpi_exporter:
     repository: 'opencord/kafka-topic-exporter'
-    tag: '1.2.1'
+    tag: '1.2.3'
     pullPolicy: 'Always'
 
 nem_voltha_kpi_exporter_nodePort: 31080