revert "chore(deps): update helm release metallb to v0.13.2"

Turns out there are unexpected structural changes in this upgrade that
we need to address separately.

It requires to deploy a CR after successful deployment, which means
we'll have to move the helm chart to bootstrape of work around this in
another way.

infrastructure/metallb/release.yaml

@@ -12,7 +12,7 @@ spec:
         kind: HelmRepository
         name: metallb
         namespace: metallb-system
-      version: 0.13.2
+      version: 0.12.1
   interval: 5m
   install:
     crds: CreateReplace