Update CircleCI docker image to use helm 2.16.9

Author: AbhyudayaSharma

.circleci/config.yml

@@ -17,7 +17,7 @@ jobs:
     working_directory: ~/stackstorm-ha
     docker:
       # Pin Helm to v2.x, see https://github.com/StackStorm/stackstorm-ha/issues/98
-      - image: lachlanevenson/k8s-helm:v2.16.7
+      - image: lachlanevenson/k8s-helm:v2.16.9
     steps:
       - checkout
       - run: