Update Helm release metallb to v0.16.0 (main)

This MR contains the following updates:

Package	Update	Change
metallb (source)	minor	0.15.3 -> 0.16.0

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Related reference(s)

Closes #3325 (closed) and #3738 (closed)

kube-rbac-proxy image in metallb_helm_values.frr-k8s.prometheus.rbacProxy configuration was removed in this MR because MetalLB 0.16.0 version has replaced kube-rbac-proxy with native TLS and RBAC.

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Release Notes

metallb/metallb (metallb)

v0.16.0

Compare Source

See the release notes for the details:

https://metallb.universe.tf/release-notes/#version-0-16-0

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