fix(metallb): Disable FRR again, after failing to upgrade

This patch disables the change from upstream, which enables FRR by
default, as it fails without proper error message in L2 mode.

Reference:
https://github.com/metallb/metallb/commit/8286bd3c98b70e0121b500df3f72653fa17a831b

infrastructure/metallb/release.yaml

@@ -35,6 +35,9 @@ metadata:
   namespace: metallb-system
 data:
   values.yaml: |
+    speaker:
+      frr:
+        enabled: false
     prometheus:
       podMonitor:
         enabled: true