Fix: faulty append

ekms/internal/kms/kms.go

@@ -276,10 +276,10 @@ func (kms *EKMS) GenerateAndSendKSAKey(address string, requestId string, number
 
 		encryptedKSAKeyAsString := base64.StdEncoding.EncodeToString(encryptedKSAKey)
 
-		keys = append(keys, &pbIC.Key{
+		keys[i] = &pbIC.Key{
 			Id:  ksaKeyId.String(),
 			Key: encryptedKSAKeyAsString,
-		})
+		}
 	}
 
 	// TODO: move this somewhere else!