Use New Stable Chart URL

The existing URL no longer works. This commit updates the Chart
dependencies to use the new Stable chart URL.

This will fix the "Chart not found" errors that occur if these example
resources are used.

Please keep in mind this is only a bandaid, as the repository is still
EOL, and should not be used.

contrib/local-environment/kubernetes/Chart.lock

@@ -1,9 +1,9 @@
 dependencies:
 - name: dex
-  repository: https://kubernetes-charts.storage.googleapis.com
+  repository: https://charts.helm.sh/stable
   version: 2.11.0
 - name: oauth2-proxy
-  repository: https://kubernetes-charts.storage.googleapis.com
+  repository: https://charts.helm.sh/stable
   version: 3.1.0
 - name: httpbin
   repository: https://conservis.github.io/helm-charts
@@ -11,5 +11,5 @@ dependencies:
 - name: hello-world
   repository: https://conservis.github.io/helm-charts
   version: 1.0.1
-digest: sha256:ce64f06102abb551ee23b6de7b4cec3537f4900de89412458e53760781005aac
-generated: "2020-06-16T16:59:19.126187-05:00"
+digest: sha256:e325948ece1706bd9d9e439568985db41e9a0d57623d0f9638249cb0d23821b8
+generated: "2020-11-23T11:45:07.908898-08:00"

contrib/local-environment/kubernetes/Chart.yaml

@@ -6,10 +6,10 @@ appVersion: 5.1.1
 dependencies:
   - name: dex
     version: 2.11.0
-    repository: https://kubernetes-charts.storage.googleapis.com
+    repository: https://charts.helm.sh/stable
   - name: oauth2-proxy
     version: 3.1.0
-    repository: https://kubernetes-charts.storage.googleapis.com
+    repository: https://charts.helm.sh/stable
   # https://github.com/postmanlabs/httpbin/issues/549 is still in progress, for now using a non-official chart
   - name: httpbin
     version: 1.0.1