Guidance on "un-spying" a method

Hi, I couldn't quite figure out how to un-spy a spied method yet. I'm not sure if it's even possible after browsing through the source code. 

```python
spy_foo = mocker.spy(module, "foo")

# do something

# how to un-spy `spy_foo`?
```

Any ideas or suggestions on how to achieve it? 🙏 