[RxJS] `FromEvent` type missmatch since 7.5.6

If using RxJS >=7.5.6, we could not parse rxjs's `fromEvent` to a `typed-emitter/rxjs` `fromEvent` :

```
import { fromEvent as rxFromEvent } from 'rxjs'
const fromEvent = rxFromEvent as FromEvent
```

..my VSCode says at line 2 that both types are not compatible.