Update Rust crate which to v5

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
which	dependencies	major	4.4 -> 5.0

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Release Notes

harryfei/which-rs (which)

### [`v5.0.0`](https://togithub.com/harryfei/which-rs/blob/HEAD/CHANGELOG.md#500) - Remove several unused error messages - Windows executables can now be found even if they don't have a '.exe' extension. - Add new error message, `Error::CannotGetCurrentDirAndPathListEmpty` ### [`v4.4.2`](https://togithub.com/harryfei/which-rs/blob/HEAD/CHANGELOG.md#442) [Compare Source](https://togithub.com/harryfei/which-rs/compare/4.4.1...4.4.2) - Remove dependency on `dirs` crate due to MPL licensing in its tree. Use `home` crate instead. ([@​Xaeroxe](https://togithub.com/Xaeroxe)) ### [`v4.4.1`](https://togithub.com/harryfei/which-rs/blob/HEAD/CHANGELOG.md#441) [Compare Source](https://togithub.com/harryfei/which-rs/compare/4.4.0...4.4.1) - Add tilde expansion for home directory ([@​Xaeroxe](https://togithub.com/Xaeroxe)) - Swap out libc for rustix, forbid unsafe ([@​notgull](https://togithub.com/notgull))

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