Bump cluster-applications version

In addition to bumping the version,
it also add custom value files for
falco and apparmor

changelogs/unreleased/bump_cluster_applications_version.yml

+---
+title: Bump cluster-applications version to v0.20.0
+merge_request: 34569
+author:
+type: added

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

 apply:
   stage: deploy
-  image: "registry.gitlab.com/gitlab-org/cluster-integration/cluster-applications:v0.17.0"
+  image: "registry.gitlab.com/gitlab-org/cluster-integration/cluster-applications:v0.20.0"
   environment:
     name: production
   variables:
@@ -20,6 +20,8 @@ apply:
     FLUENTD_VALUES_FILE: $CI_PROJECT_DIR/.gitlab/managed-apps/fluentd/values.yaml
     KNATIVE_VALUES_FILE: $CI_PROJECT_DIR/.gitlab/managed-apps/knative/values.yaml
     POSTHOG_VALUES_FILE: $CI_PROJECT_DIR/.gitlab/managed-apps/posthog/values.yaml
+    FALCO_VALUES_FILE: $CI_PROJECT_DIR/.gitlab/managed-apps/falco/values.yaml
+    APPARMOR_VALUES_FILE: $CI_PROJECT_DIR/.gitlab/managed-apps/apparmor/values.yaml
   script:
     - gitlab-managed-apps /usr/local/share/gitlab-managed-apps/helmfile.yaml
   only: