Update endpoints model

Author: AWS SDK for Go v2 automation user

codegen/smithy-aws-go-codegen/src/main/resources/software/amazon/smithy/aws/go/codegen/endpoints.json

@@ -9083,6 +9083,7 @@
             },
             "hostname" : "portal.sso.ap-northeast-2.amazonaws.com"
           },
+          "ap-northeast-3" : { },
           "ap-south-1" : {
             "credentialScope" : {
               "region" : "ap-south-1"