KEP-4247: Update status from 'implementable' to 'implemented'

Author: sanposhiho

keps/sig-scheduling/4247-queueinghint/kep.yaml

@@ -5,7 +5,7 @@ authors:
 owning-sig: sig-scheduling
 participating-sigs:
   - sig-scheduling
-status: implementable
+status: implemented
 creation-date: 2023-09-30
 reviewers:
   - "@alculquicondor"