tempfile provides functions for tempdirs too,
so we do not need an old, deprecated dep.
This also gets rid of a minor dependabot advisory,
not actually exploitable in our usage.
@workingjubilee You have to actually run cargo test in order to check if tests compile, Jubilee, you can't get away with a quick cargo check unless it is cargo check --tests.
tempfile provides functions for tempdirs too, so we do not need an old, deprecated dep. This also gets rid of a minor dependabot advisory, not actually exploitable in our usage.