grafana-aether: Fix refresh interval

Change-Id: I1cbe30043b7556c30158ca8d959314b1c9f0af03
diff --git a/monitoring/grafana-aether/Chart.yaml b/monitoring/grafana-aether/Chart.yaml
index 3774910..60f18fd 100644
--- a/monitoring/grafana-aether/Chart.yaml
+++ b/monitoring/grafana-aether/Chart.yaml
@@ -5,6 +5,6 @@
 name: grafana-aether
 description: A Helm chart for deploying Grafana with Aether dashboards
 
-version: 0.4.8
+version: 0.4.9
 
 appVersion: 0.1.0