`anextawaitable_close()` should be a `METH_NOARGS` not `METH_VARARGS`

[picnixz]

Bug report

Bug description:

See #131609 (comment).

We can backport it because a TypeError is already raised (it's not raised by anext_awaitable.close, but rather by coroutine_wrapper).

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

• gh-131666: mark anext_awaitable.close as a METH_NOARGS instead of METH_VARARGS #131671