node: podres: getalloc: fix expected stage

We just forgot to update previously for the work
planned in 1.28.

Signed-off-by: Francesco Romani <[email protected]>

Author: ffromani

keps/sig-node/2403-pod-resources-allocatable-resources/kep.yaml

@@ -21,7 +21,7 @@ see-also:
 replaces: []
 
 # 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