Types: forkJoin(any) and combineLatest(any) return the wrong thing

[benlesh]

// FAIL: Gives us Observable<{ [key: string]: unknown }>
const source1 = forkJoin([of(1), of(2)] as any); // $ExpectType Observable<unknown>

// FAIL: Gives us Observable<{ [key: string]: unknown }>
const source2 = combineLatest([of(1), of(2)] as any); // $ExpectType Observable<unknown>

Basically, if we get an any to either one of these, we have no way of knowing if we're getting back an array or an object, so we need to return unknown.