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rust: remove `atty` dependency

It is fully replaced with the now stable `std::io::IsTerminal` trait.

This was the last dependency flagged as a warning by `cargo audit`,
aside from `cpython` which we know about all too well: the plan is to
transition to PyO3 soon-ish.

This directory is meant to cache artifacts useful for tests (such as bundle).

Those artifacts need to be cached because they are slow to regenerate on each
test but too large to be tracked within the repository. They are not expected
to change between each run and can be cached.

The `./scripts/` contains code to generate the artifact while the `cache`
directory contains resulting artifact.