mark KEP-3458 as implemented

Author: carlory

keps/sig-network/3458-remove-transient-node-predicates-from-service-controller/kep.yaml

@@ -11,7 +11,7 @@ approvers:
   - "@thockin"
 creation-date: "2022-08-07"
 last-updated: v1.30
-status: implementable
+status: implemented
 stage: stable
 latest-milestone: "v1.30"
 milestone: