Update API model

AWS SDK for Go v2 automation user · AWS SDK for Go v2 automation user · commit 88922f24c60c · 2022-06-27T18:04:08.000Z
diff --git a/codegen/sdk-codegen/aws-models/iot.json b/codegen/sdk-codegen/aws-models/iot.json
@@ -26628,7 +26628,7 @@
             "type": "string",
             "traits": {
                 "smithy.api#length": {
-                    "min": 1,
+                    "min": 0,
                     "max": 256
                 }
             }
