k8s: Kubernetes v1.36: Mixed Version Proxy Graduates to Beta

Kubernetes 1.36 graduates the Mixed Version Proxy (feature gate UnknownVersionInteroperabilityProxy) to Beta and enables it by default. The feature now uses Aggregated Discovery, adds peer-aggregated discovery for unified API listings across control-plane nodes, and requires --peer-ca-file plus peer advertise settings for secure API server-to-server proxying.

• Source: Kubernetes Official Blog