Promote feature to stable

Author: cici37

keps/prod-readiness/sig-api-machinery/3488.yaml

@@ -3,3 +3,6 @@ alpha:
   approver: "@johnbelamaric"
 beta:
   approver: "@johnbelamaric"
+stable:
+  approver: "@johnbelamaric"
+

keps/sig-api-machinery/3488-cel-admission-control/kep.yaml

@@ -33,17 +33,18 @@ see-also:
   - "/keps/sig-api-machinery/2876-crd-validation-expression-language"
 
 # The target maturity stage in the current dev cycle for this KEP.
-stage: beta
+stage: stable
 
 # The most recent milestone for which work toward delivery of this KEP has been
 # done. This can be the current (upcoming) milestone, if it is being actively
 # worked on.
-latest-milestone: "v1.29"
+latest-milestone: "v1.30"
 
 # The milestone at which this feature was, or is targeted to be, at each stage.
 milestone:
   alpha: "v1.26"
   beta: "1.28"
+  stable: "1.30"
 
 
 # The following PRR answers are required at alpha release