[no-standalone-expect]: false positive for `expect.any` in `__mocks__` file

I have a file in `__mocks__` called `twitch-js-api.js` and I'm using the following:

```js
const formatStreams = jest.fn().mockReturnValue([
  {
    channel: {
      logo: expect.any(String)
    }
  }
])
```

Yet this rule now warns on `expect.any(String)`? Isn't `expect` allowed in mock files? This code has worked for years.