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

@@ -4968,6 +4968,7 @@
             } ]
           },
           "ap-southeast-5" : { },
+          "ap-southeast-7" : { },
           "ca-central-1" : {
             "variants" : [ {
               "hostname" : "cloudhsmv2.ca-central-1.api.aws",