feat: update AWS service endpoints metadata

Author: aws-sdk-kotlin-ci

codegen/aws-sdk-codegen/src/main/resources/aws/sdk/kotlin/codegen/endpoints.json

@@ -11619,6 +11619,7 @@
           "ap-south-1" : { },
           "ap-southeast-1" : { },
           "ap-southeast-2" : { },
+          "ap-southeast-4" : { },
           "ca-central-1" : { },
           "eu-central-1" : { },
           "eu-north-1" : { },
@@ -11640,6 +11641,7 @@
           "ap-south-1" : { },
           "ap-southeast-1" : { },
           "ap-southeast-2" : { },
+          "ap-southeast-4" : { },
           "ca-central-1" : { },
           "eu-central-1" : { },
           "eu-north-1" : { },
@@ -11661,6 +11663,7 @@
           "ap-south-1" : { },
           "ap-southeast-1" : { },
           "ap-southeast-2" : { },
+          "ap-southeast-4" : { },
           "ca-central-1" : { },
           "eu-central-1" : { },
           "eu-north-1" : { },