Update endpoints model

Author: aws-sdk-swift-automation

codegen/sdk-codegen/sdk-endpoints.json

@@ -11913,9 +11913,21 @@
       },
       "iotfleetwise" : {
         "endpoints" : {
-          "ap-south-1" : { },
-          "eu-central-1" : { },
-          "us-east-1" : { }
+          "ap-south-1" : {
+            "variants" : [ {
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "eu-central-1" : {
+            "variants" : [ {
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "us-east-1" : {
+            "variants" : [ {
+              "tags" : [ "dualstack" ]
+            } ]
+          }
         }
       },
       "iotsecuredtunneling" : {