Update Helm release aws-load-balancer-controller to v3.1.0

Author: govuk-ci

terraform/deployments/cluster-services/aws_lb_controller.tf

@@ -9,7 +9,7 @@ resource "helm_release" "aws_lb_controller" {
   name             = "aws-load-balancer-controller"
   repository       = "https://aws.github.io/eks-charts"
   chart            = "aws-load-balancer-controller"
-  version          = "3.0.0"
+  version          = "3.1.0"
   namespace        = local.services_ns
   create_namespace = true
   timeout          = var.helm_timeout_seconds