Bump cluster applications CI template to 0.34.1

This changes repo location for Nginx Ingress, fluentD, and Prometheues
to vendored charts as the stable repo is scheduled to be deleted after
2020-11-13.

changelogs/unreleased/update-cluster-applications-0-34-1.yml

+---
+title: Update cluster applications CI template to 0.34.1
+merge_request: 45487
+author:
+type: fixed

doc/user/clusters/applications.md

@@ -647,6 +647,23 @@ applications you have configured. In case of pipeline failure, the
 output of the [Helm Tiller](https://v2.helm.sh/docs/install/#running-tiller-locally) binary
 is saved as a [CI job artifact](../../ci/pipelines/job_artifacts.md).
 
+For GitLab versions 13.5 and below, the Ingress, Fluentd, Prometheus,
+and Sentry apps are fetched from the central Helm [stable
+repository](https://kubernetes-charts.storage.googleapis.com/), which
+will be [deleted](https://github.com/helm/charts#deprecation-timeline)
+on November 13, 2020. This will cause the installation CI/CD pipeline to
+fail. Upgrade to GitLab 13.6, or alternatively, you can
+use the following `.gitlab-ci.yml`, which has been tested on GitLab
+13.5:
+
+```yaml
+include:
+  - template: Managed-Cluster-Applications.gitlab-ci.yml
+
+apply:
+  image: "registry.gitlab.com/gitlab-org/cluster-integration/cluster-applications:v0.34.1"
+```
+
 ### Important notes
 
 Note the following:

lib/gitlab/ci/templates/Managed-Cluster-Applications.gitlab-ci.yml

 apply:
   stage: deploy
-  image: "registry.gitlab.com/gitlab-org/cluster-integration/cluster-applications:v0.33.0"
+  image: "registry.gitlab.com/gitlab-org/cluster-integration/cluster-applications:v0.34.1"
   environment:
     name: production
   variables: