Need to update cachetools decorator type stub with paramspec

In https://github.com/python/typeshed/blob/master/third_party/2and3/cachetools/decorators.pyi, `ParamSpec` needs to be added to the `Callable` and `ContextManager` params
```
def cached(
    cache: Optional[MutableMapping[_KT, _VT]], key: Callable[..., _KT] = ..., lock: Optional[ContextManager[_T_co]] = ...
) -> Callable[[_T], _T]: ...
```