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

@@ -5835,6 +5835,7 @@
               "tags" : [ "dualstack" ]
             } ]
           },
+          "mx-central-1" : { },
           "sa-east-1" : {
             "variants" : [ {
               "hostname" : "cognito-identity.sa-east-1.amazonaws.com",
@@ -6071,6 +6072,7 @@
               "tags" : [ "dualstack" ]
             } ]
           },
+          "mx-central-1" : { },
           "sa-east-1" : {
             "variants" : [ {
               "hostname" : "cognito-idp.sa-east-1.amazonaws.com",