Daemonize does not work with requests library

The following code fails on my Mac OS X in daemon but not in foreground mode:

```python
import requests

def main():
    while True:
        requests.get('https://httpbin.org/get')
        sleep(10)

daemon = Daemonize(app="demo_app", pid="/tmp/demo_app.pid", action=main)
daemon.start()
```

I'm using Python 3.8.5, daemonize 2.5.0 and requests 2.24.0