feat: update AWS service endpoints metadata

Author: aws-sdk-kotlin-ci

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

@@ -3781,6 +3781,7 @@
           "ap-south-2" : { },
           "ap-southeast-1" : { },
           "ap-southeast-2" : { },
+          "ap-southeast-3" : { },
           "ap-southeast-4" : { },
           "bedrock-ap-northeast-1" : {
             "credentialScope" : {