KEP-3926: update KEP beta milestone to v1.35

Author: ibihim

keps/sig-auth/3926-handling-undecryptable-resources/kep.yaml

@@ -30,7 +30,7 @@ latest-milestone: "v1.34"
 # The milestone at which this feature was, or is targeted to be, at each stage.
 milestone:
   alpha: "v1.32"
-  beta: ""
+  beta: "v1.35"
   stable: ""
 
 # The following PRR answers are required at alpha release