Update API model

Author: AWS SDK for Go v2 automation user

codegen/sdk-codegen/aws-models/appflow.json

@@ -291,7 +291,7 @@
  "traits": {
  "smithy.api#length": {
  "min": 0,
- "max": 2048
+ "max": 4096
  },
  "smithy.api#pattern": "^\\S+$"
  }
@@ -6707,7 +6707,7 @@
  "traits": {
  "smithy.api#length": {
  "min": 0,
- "max": 2048
+ "max": 4096
  },
  "smithy.api#pattern": "^\\S+$"
  }