chore: helm2 verison bump (#4724)

* chore: helm2 verison bump

hack/tool-versions.sh

 #!/bin/sh
 # The checksum of this file is used as cache key in our integratoin toolchain
 # 
-helm2_version=2.15.2
+helm2_version=2.17.0
 helm3_version=3.2.0
 jq_version=1.6
 ksonnet_version=0.13.1

util/helm/testdata/helm2-dependency/requirements.lock

 dependencies:
 - name: mariadb
-  repository: https://kubernetes-charts.storage.googleapis.com/
-  version: 4.3.1
-digest: sha256:82a0e5374376169d2ecf7d452c18a2ed93507f5d17c3393a1457f9ffad7e9b26
-generated: 2018-08-02T22:07:51.905271776Z
+  repository: https://charts.helm.sh/stable
+  version: 4.4.2
+digest: sha256:c07f89818ebcd92a4dbaff719ebedc14e2569ee27447d3abf739e2dd11d13fcb
+generated: "2020-11-03T09:04:00.781031-08:00"

util/helm/testdata/helm2-dependency/requirements.yaml

 dependencies:
 - name: mariadb
   version: 4.x.x
-  repository: https://kubernetes-charts.storage.googleapis.com/
+  repository: https://charts.helm.sh/stable
   condition: mariadb.enabled
   tags:
     - wordpress-database