Runtime type checking broken for `*args` and `**kwargs`

[sleiner]

Consider this example (derived from starlark/src/typing/tests/golden/types_of_args_kwargs.golden):

# reproducer.star
def foo(*args: str, **kwargs: int):
    pass

def test():
    foo("a")
    foo(b=1)

test()

This is valid code according to according to PEP 484, valid according to starlark-rust's static type checker (tested in typing::tests::call::test_types_of_args_kwargs), but unfortunately invalid when actually run with type checking.

Tested on bdc8f8e.