feat: update AWS service endpoints metadata

Author: aws-sdk-kotlin-ci

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

@@ -21,7 +21,7 @@
     "dnsSuffix" : "amazonaws.com",
     "partition" : "aws",
     "partitionName" : "AWS Standard",
-    "regionRegex" : "^(us|eu|ap|sa|ca|me|af|il)\\-\\w+\\-\\d+$",
+    "regionRegex" : "^(us|eu|ap|sa|ca|me|af|il|mx)\\-\\w+\\-\\d+$",
     "regions" : {
       "af-south-1" : {
         "description" : "Africa (Cape Town)"