Bring 1040 kep.yaml up to date

Signed-off-by: Mike Spreitzer <[email protected]>

keps/sig-api-machinery/1040-priority-and-fairness/kep.yaml

@@ -27,13 +27,13 @@ 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: "v1.27"
+latest-milestone: "v1.29"
 
 # The milestone at which this feature was, or is targeted to be, at each stage.
 milestone:
   alpha: "v1.18"
   beta: "v1.20"
-  stable: "v1.28"
+  stable: "v1.29"
 
 # The following PRR answers are required at alpha release.
 # List the feature gate name and the components for which it must be enabled.