Multiple Tuple return types missing type arguments

Many methods returning a tuple are missing type arguments for said tuple.

I am mainly interested in `QFileDialog.getOpenFileName` and `QFileDialog.getSaveFileName`, but as you can see above, this affects many methods.

Sidenote, if it's a "TODO", please leave it as unknown and don't hide it with `tuple[Any,...]` just to close this issue. It only affects pyright users with strict type-checking (mypy infers as `Any` since it has no concept of `Unknown`) and it has an important semantic difference (an explicit `Any` return type meaning the type simply cannot be expressed within the current type system)