Update endpoints model

Author: AWS SDK for Go v2 automation user

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

@@ -21084,7 +21084,8 @@
           "protocols" : [ "https" ]
         },
         "endpoints" : {
-          "cn-north-1" : { }
+          "cn-north-1" : { },
+          "cn-northwest-1" : { }
         }
       },
       "airflow" : {