Update KEP-4193 milestone for 1.30

Author: munnerz

keps/prod-readiness/sig-auth/4193.yaml

@@ -1,3 +1,5 @@
 kep-number: 4193
 alpha:
   approver: "deads2k"
+beta:
+  approver: "@deads2k"

keps/sig-auth/4193-bound-service-account-token-improvements/kep.yaml

@@ -23,7 +23,7 @@ stage: alpha
 # 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: