Update kep.yaml

Author: jayunit100

keps/sig-network/1611-network-policy-validation/kep.yaml

@@ -14,8 +14,8 @@ approvers:
   - TBD
 editor: TBD
 creation-date: 2020-02-04
-last-updated: 2020-5-01
-status: implementable
+last-updated: 2021-3-05
+status: implemented
 
 latest-milestone: "0.0"
-stage: "alpha"
+stage: "GA"