PySequence: change some more return types to PyResult<'p, PyObject<'p>>
PySequence: change some more return types to PyResult<'p, PyObject<'p>>

dgrunwald/rust-cpython,dgrunwald/rust-cpython,naufraghi/rust-cpython,naufraghi/rust-cpython,eneas193933/rust-cpython,naufraghi/rust-cpython