update KEP metadata.

Author: jiahuif

keps/sig-cloud-provider/991-cloud-controller-migration/kep.yaml

@@ -12,7 +12,7 @@ approvers:
   - "@lavalamp"
 editor: TBD
 creation-date: 2019-04-22
-last-updated: 2019-04-22
+last-updated: 2021-02-08
 status: implementable
 see-also:
   - "/keps/sig-cloud-provider/20180530-cloud-controller-manager.md"