Update Helm release metallb to v0.15.2

Author: renovate[bot]

fleet/lib/metallb/fleet.yaml

@@ -8,7 +8,7 @@ helm:
   chart: *name
   releaseName: *name
   repo: https://metallb.github.io/metallb
-  version: 0.14.9
+  version: 0.15.2
   # daemonset rollout may take > 300s on larger clusters
   timeoutSeconds: 900
   waitForJobs: true