Update endpoints model

Author: AWS SDK for Go v2 automation user

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

@@ -29358,6 +29358,16 @@
           "us-isob-east-1" : { }
         }
       },
+      "budgets" : {
+        "endpoints" : {
+          "us-isob-east-1" : {
+            "credentialScope" : {
+              "region" : "us-isob-east-1"
+            },
+            "hostname" : "budgets.us-isob-east-1.sc2s.sgov.gov"
+          }
+        }
+      },
       "cloudcontrolapi" : {
         "endpoints" : {
           "us-isob-east-1" : { }