Update dependency alpine/helm to v3.9.0

.gitlab-ci.yml

@@ -16,7 +16,7 @@ stages:
 lint:
   stage: test
   image:
-    name: alpine/helm:3.8.2
+    name: alpine/helm:3.9.0
     entrypoint: ["/bin/sh", "-c"]
   script:
     - helm lint $CHART
@@ -29,7 +29,7 @@ lint:
 package_charts:
   stage: package
   image:
-    name: alpine/helm:3.8.2
+    name: alpine/helm:3.9.0
     entrypoint: ["/bin/sh", "-c"]
   script:
     # The helm-push command is broken in Helm 3.7. For more information,