Auto merge of #7256 - xFrednet:7172-trick-cargos-caching-for-collection, r=flip1995

Auto merge of #7256 - xFrednet:7172-trick-cargos-caching-for-collection, r=flip1995

Adding the ability to invalidate caches to force metadata collection

This adds the discussed hack to touch `clippy_lints/src/lib.rs` to invalidate cargos cache and force metadata collection. I've decided to use the [`filetime`](https://github.com/alexcrichton/filetime) crate instead of the touch command to make is cross-platform and just cleaner in general. Looking at the maintainers I would say that it's a save crate to use xD.

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cc: #7172 I know this ID without looking it up now... This is not good

changelog: none

r? `@flip1995`