chore(deps): update helm chart zammad to v4.2.0

Author: renovate[bot]

apps/extra/zammad/helm.yaml

@@ -8,7 +8,7 @@ spec:
     spec:
       # renovate: registryUrl=https://zammad.github.io/zammad-helm
       chart: zammad
-      version: 4.1.0
+      version: 4.2.0
       sourceRef:
         kind: HelmRepository
         name: zammad