Mark completed 1.34 sig-auth features as implemented

Author: liggitt

keps/sig-auth/4601-authorize-with-selectors/kep.yaml

@@ -4,7 +4,7 @@ authors:
   - "@deads2k"
 owning-sig: sig-auth
 participating-sigs:
-status: implementable
+status: implemented
 creation-date: 2024-04-26
 reviewers:
   - "@liggitt"

keps/sig-auth/4633-anonymous-auth-configurable-endpoints/kep.yaml

@@ -5,7 +5,7 @@ authors:
 owning-sig: sig-auth
 participating-sigs:
   - sig-auth
-status: implementable
+status: implemented
 creation-date: 2024-05-13
 reviewers:
   - "@liggitt"