Update cluster-applications to 0.13.1

This will introduce support for Cilium 1.7.1 and will lock Hubble to
version 0.5.0

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

 apply:
   stage: deploy
-  image: "registry.gitlab.com/gitlab-org/cluster-integration/cluster-applications:v0.12.0"
+  image: "registry.gitlab.com/gitlab-org/cluster-integration/cluster-applications:v0.13.1"
   environment:
     name: production
   variables: