Merge branch 'renovate/metallb-2.x' into 'master'

Update Helm release metallb to v2.5.7

See merge request openappstack/openappstack!556

flux2/core/base/metallb/release.yaml

@@ -11,7 +11,7 @@ spec:
       # https://artifacthub.io/packages/helm/bitnami/metallb
       # renovate: registryUrl=https://charts.bitnami.com/bitnami
       chart: metallb
-      version: 2.5.6
+      version: 2.5.7
       sourceRef:
         kind: HelmRepository
         name: bitnami