JWT seems to be expiring, and resulting error does not set status text yet looks for it

Response received has `statusText` set to `null`.
```
response: { status: 401, statusText: null, data: { message: 'Unauthorized' } }
```

Yet it seems to check for `statusText` when receiving the `401` and does not get a new JWT / retry:
https://github.com/OpenZeppelin/defender-client/blob/master/packages/base/src/api/client.ts#L33