[[PR Description]] This replaces the `tempdir` crate with `tempfile`, which resolves [RUSTSEC-2018-0017](https://rustsec.org/advisories/RUSTSEC-2018-0017).
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[[PR Description]] This replaces the `tempdir` crate with `tempfile`, which resolves [RUSTSEC-2018-0017](https://rustsec.org/advisories/RUSTSEC-2018-0017).