bump component slis to stable

Author: Han Kang

Diff for: keps/prod-readiness/sig-instrumentation/3466.yaml

@@ -6,3 +6,5 @@ alpha:
   approver: "@wojtek-t"
 beta:
   approver: "@wojtek-t"
+stable:
+  approver: "@wojtek-t"

Diff for: keps/sig-instrumentation/3466-kubernetes-component-health-slis/kep.yaml

@@ -15,7 +15,7 @@ reviewers:
 approvers:
   - "@dgrisonnet"
 # The target maturity stage in the current dev cycle for this KEP.
-stage: alpha
+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