rust: bump rust-cpython version for 0.6.0
That function as a nice `is_none` method on `PyObject` that we will put to use. Differential Revision: https://phab.mercurial-scm.org/D10962
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That function as a nice `is_none` method on `PyObject` that we will put to use. Differential Revision: https://phab.mercurial-scm.org/D10962