chore(metallb): Upgrade back to 0.14.3

This patch reverts the previous revert.

It seems the outage was caused by the new feature of supporting
`node.kubernetes.io/exclude-from-external-load-balancers`, which was set
on all nodes, resulting in non being used by metallb. Therefore the
upgrade should be fine, it was just an unexpectedly well working feature
that caused the outage.

infrastructure/metallb/release.yaml

@@ -12,7 +12,7 @@ spec:
         kind: HelmRepository
         name: metallb
         namespace: metallb-system
-      version: 0.13.12
+      version: 0.14.3
   interval: 5m
   install:
     crds: CreateReplace