```release-note:bug
resource/aws_cognito_user_pool_client: Retry on `ConcurrentModificationException`
```

```release-note:bug
resource/aws_cognito_user_pool_client: Allow the `default_redirect_uri` argument value to be an empty string
```

```release-note:enhancement
resource/aws_cognito_user_pool_client: Add the `enable_token_revocation` argument to support targeted sign out
```