feat(clients): update client endpoints as of 2026-07-02

Author: awstools

codegen/smithy-aws-typescript-codegen/src/main/resources/software/amazon/smithy/aws/typescript/codegen/endpoints.json

@@ -6466,6 +6466,7 @@
             "ap-southeast-3": {},
             "ap-southeast-4": {},
             "ap-southeast-5": {},
+            "ap-southeast-6": {},
             "ca-central-1": {
               "variants": [
                 {