Update KEP status to provisional

Author: sreeram-venkitesh

keps/sig-api-machinery/4595-cel-crd-additionalprintercolumns/kep.yaml

@@ -14,7 +14,7 @@ approvers:
   - "@jpbetz"
 creation-date: "2024-04-26"
 last-updated: "v1.34"
-status: implementable
+status: provisional
 stage: alpha
 
 latest-milestone: "1.34"