Race Condition in httpx (httpcore)

```
ERROR    bbot.scanner:scanner.py:781 Error in ntlm.handle_event(HTTP_RESPONSE("{'url': 'http://127.0.0.1:8888', 'timestamp': '2023-08-16T12:23:16.577301742-04:...", module=httpx, tags={'in-scope', 'status-200', 'distance-0', 'dir', 'ip-127-0-0-1'})): /home/bls/Downloads/code/bbot/bbot/core/helpers/misc.py:1212:cancel_tasks()
```