Fix *args/**kwargs return types. Add type hinting to py::make_tuple

[InvincibleRMC]

Description

While working on #5879. I noticed the return type of py::args/py::kwargs was wrong.

Update the return type of py::args/py::kwargs. Also updated make_tuple to typing::Tuple similar to how make_iterator uses typing::Iterator.

Suggested changelog entry:

* Fix `*args/**kwargs` return types. Add type hinting to `py::make_tuple`.