chore(rootfs/Dockerfile): update Helm to v3.6.2 (#296)

See https://github.com/helm/helm/releases/tag/v3.6.2

Author: mboersma

rootfs/Dockerfile

@@ -10,7 +10,7 @@ ENV ANSIBLE_VERSION=2.10.3 \
     GO_VERSION=1.16.6 \
     GOLANGCI_LINT_VERSION=v1.41.1 \
     GOSS_VERSION=v0.3.16 \
-    HELM_VERSION=3.5.4 \
+    HELM_VERSION=3.6.2 \
     KUBECTL_VERSION=v1.20.7 \
     PACKER_VERSION=1.7.2 \
     PROTOBUF_VERSION=3.7.0 \