cut v2.4.6 release (#2970)

update helm chart version to 1.4.7

Author: kishorj

helm/aws-load-balancer-controller/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v2
 name: aws-load-balancer-controller
 description: AWS Load Balancer Controller Helm chart for Kubernetes
-version: 1.4.6
+version: 1.4.7
 appVersion: v2.4.6
 home: https://github.com/aws/eks-charts
 icon: https://raw.githubusercontent.com/aws/eks-charts/master/docs/logo/aws.png