Update libtest-mimic to 0.5.2

[LukasKalbertodt]

I just released a new version of libtest-mimic. This is one of the bigger libaries using it, so as a sanity check whether the new version still works for real world users, I just did this update. It allowed to remove some of the code here as the API changed a bit.

Two things to note:

• libtest-mimic requires Rust 1.58.
• I do not know anything about this project and did not test anything except compiling and running the tests (via cargo test). Please review carefully and/or test.

[sunshowers]

Thanks! Looks good, I'll make sure it passes CI and then land this.

[sunshowers]

@LukasKalbertodt it looks like libtest-mimic lost the ability to do --nocapture. Could you fix this upstream? Thanks.

[sunshowers]

Since libtest-mimic can't perform --nocapture anyway, it would be best to accept the argument but just ignore it.

[sunshowers]

Submitted LukasKalbertodt/libtest-mimic#18 -- once that is released to crates.io, we can move datatest-stable over as well.

[LukasKalbertodt]

Ah dang, I should have asked you to check out my changes before I cut the release. But well, can be fixed via patch release.

[LukasKalbertodt]

I just released 0.5.2 with --nocapture. I also amended my PR here with the new commit now requiring 0.5.2.

[LukasKalbertodt]

I just fixed the clippy warnings. But the other CI jobs fail as they test with Rust 1.56. Is my assumption correct that you want to bump the MSRV of this project to 1.58? If so, should I adjust the CI jobs?

[sunshowers]

Yeah, please change CI to reflect the new MSRV. Thanks!