build helm version to match kubespray > 2.15

Signed-off-by: Cian Johnston <cian.johnston@est.tech>
Change-Id: I14eef23eaf95b5dc917ac2ca26a069932b58cbb8
Depends-On: I592ec75bfeb76444d21216652e308120c3c3ef8a
diff --git a/vars/kubernetes.yaml b/vars/kubernetes.yaml
index c0247b3..849859e 100644
--- a/vars/kubernetes.yaml
+++ b/vars/kubernetes.yaml
@@ -108,7 +108,7 @@
 # -------------------------------------------------------------------------------
 # Kubernetes: App versions
 # -------------------------------------------------------------------------------
-helm_version: "v3.3.4"
+helm_version: "v3.5.0"
 charts_version: "0b64349aeb537d0fd038df0e1d40ec5cf1206609"
 istio_version: "1.3.1"