fix(types): Fix return type of update_with_returning

[lobsterkatie]

We have a custom queryset method called update_with_returning, modeled after the built-in Django queryset update method, which adds the ability to pull data from the updated rows. Though we're currently only using it to pull data from an a single integer column, there's nothing to say that's the only kind of data we could return (and in fact, we're about to use it to return data from multiple, non-int columns). This therefore fixes the return type to be Any n-tuples rather than int 1-tuples.