Bug: string instead of "DynamoDBFullAccessInline"

Bug description

Raw command

> aws iam list-user-policies --user-name gekh
{
    "PolicyNames": [
        "DynamoDBFullAccessInline"
    ]
}

With RTK proxy:

> rtk aws iam list-user-policies --user-name gekh
{
  PolicyNames:
  [
    string
  ]
}

expected:

DynamoDBFullAccessInline

How to reproduce

First create a file ddb-full-access-inline.json:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": "dynamodb:*",
      "Resource": "*"
    }
  ]
}

and run

aws iam put-user-policy \
  --user-name [REPLACE_WITH_USERNAME] \
  --policy-name DynamoDBFullAccessInline \
  --policy-document file://ddb-full-access-inline.json

after creation run thic command

rtk aws iam list-user-policies --user-name [REPLACE_WITH_USERNAME]