Audit advisory for remove_dir_all, via tempfile

[ZackPierce]

Presently cargo audit reveals the following security advisory for criterion.

https://rustsec.org/advisories/RUSTSEC-2023-0018

The root cause is remove_dir_all, a transitive dev dependency of criterion via tempfile.

The audit warning may be trivially cleared up by updating the tempfile dependency to, say, 3.5.

Per the contributing guidelines, I have not submitted a PR to do so until the maintainers express an interest in fixing this mild security risk.

[nbarrios1337]

PR addressing this issue: #675

[waywardmonkeys]

This be closed as it was fixed in #675.