### 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_
Path="/",
            RoleName=role_name_2,
            AssumeRolePolicyDocument=str_assume_role_policy_doc,
            Description="string",
        )
        roles = aws_client.iam.list_roles()["Roles"]
        for role in roles:
            if role["RoleName"] in [role_name_1, role_name_2]:
                assert role["AssumeRolePolicyDocument"] == assume_role_policy_doc
                aws_client.iam.delete_role(RoleName=role["RoleName"])
        aws_client.iam.create_role(
            Path="myPath",
            RoleName=role_name_2,
            AssumeRolePolicyDocument=str_assume_role_policy_doc,
            Description="string",
        )
        roles = aws_client.iam.list_roles(PathPrefix="my")
        assert roles["Roles"][0]["Path"] == "myPath"
        assert roles["Roles"][0]["RoleName"] == role_name_2
        assert len(roles["Roles"]) == 1
    @pytest.mark.aws_validated
    @pytest.mark.xfail
    @pytest.mark.parametrize(
        "service_name, expected_role",
        [
            ("ecs.amazonaws.com", "AWSServiceRoleForECS"),
            ("eks.amazonaws.com", "AWSServiceRoleForAmazonEKS"),
        ],
    )
    def test_service_linked_role_name_should_match_aws(