Revert "Upgrading metallb"

This reverts commit 4393fb4ea5.

bootstrap/helmrepositories/helmrepository-bitnami.yaml

@@ -2,8 +2,8 @@
 apiVersion: source.toolkit.fluxcd.io/v1beta1
 kind: HelmRepository
 metadata:
-  name: bitnami
+  name: metallb
   namespace: flux-system
 spec:
   interval: 15m
-  url: https://charts.bitnami.com/bitnami
+  url: https://metallb.github.io/metallb

bootstrap/kustomizations/kustomization-metallb.yaml

@@ -16,4 +16,4 @@ spec:
     - apiVersion: apps/v1
       kind: Deployment
       name: metallb-controller
-      namespace: metallb-system
+      namespace: metallb-system