Change KEP status to 'implementable'

Co-authored-by: Mo Khan <[email protected]>
Signed-off-by: m.nabokikh <[email protected]>

Author: nabokihms

keps/sig-auth/3325-self-subject-attributes-review-api/kep.yaml

@@ -14,7 +14,7 @@ approvers:
 - TBD
 prr-approvers: []
 creation-date: "2022-05-30"
-status: provisional
+status: implementable
 stage: alpha
 latest-milestone: "v1.25"
 milestone: