### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

When attempting to list roles where permission boundaries are attached the response cannot be serialized 

`aws --endpoint-url=http://localhost:4566 iam list-roles --region ap-southeast-2`
```
An error occurred (InternalError) when calling the ListRoles operation (reached max retries: 2): exception while calling iam.ListRoles: Invalid type when serializing AttachedPermissionsBoundary: '<Element 'member' at 0xffff8275ef20>' cannot be parsed to structure.
```

### Expected Behavior

Expect that all roles are listed

### How are you starting LocalStack?

With a docker-compose file

### Steps To Reproduce

#### How are you starting localstack (e.g., `bin/localstack` command, arguments, or `docker-compose.yml`)

    docker run localstack/localstack

#### Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)

* Create an IAM policy
* Create an IAM role which used the policy as a permission boundary
* Attempt to list all roles with `aws --endpoint-url=http://localhost:4566 iam list-roles --region ap-southeast-2`


### Environment

```markdown
- OS: MacOS
- LocalStack: latest
```


### Anything else?

_No response_
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        if match:
            res = match.groups()[-1]
            if res.startswith("<") and res.endswith(">"):
                # va
                # TO
                return None
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                return val.split(":changeSet/")[-1]
            if "/" in res:
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                return res
            if res.startswith("layer:"):
                # ex
                match res.split(":"):
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                        return layer_name  # noqa
                    case _, layer_name:  # noqa
                        return layer_name  # noqa
            if ":" in res:
                return res.split(":")[-1]  # TO
            return res
        return None
def _change_set_id_transformer(key: str, val: str) -> str: