Update KEP.yaml

Author: Karthik-K-N

keps/sig-node/3953-node-resource-hot-plug/kep.yaml

@@ -8,7 +8,7 @@ authors:
 owning-sig: sig-node
 participating-sigs:
   - sig-node
-status: provisional
+status: implementable
 creation-date: 2023-10-04
 reviewers:
   - "@smarterclayton"