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

@@ -14013,6 +14013,7 @@
           "ap-southeast-3" : { },
           "ap-southeast-4" : { },
           "ap-southeast-5" : { },
+          "ap-southeast-6" : { },
           "ap-southeast-7" : { },
           "ca-central-1" : { },
           "ca-west-1" : { },
@@ -40223,7 +40224,7 @@
     "regionRegex" : "^eusc\\-(de)\\-\\w+\\-\\d+$",
     "regions" : {
       "eusc-de-east-1" : {
-        "description" : "EU (Germany)"
+        "description" : "AWS European Sovereign Cloud (Germany)"
       }
     },
     "services" : {