chore(deps): update which requirement from 4 to 6

[dependabot]

Updates the requirements on which to permit the latest version.

Release notes

Sourced from which's releases.

6.0.1

• Remove dependency on once_cell for Windows users, replace with std::sync::OnceLock.

Changelog

Sourced from which's changelog.

6.0.1

• Remove dependency on once_cell for Windows users, replace with std::sync::OnceLock.

6.0.0

• MSRV is now 1.70
• Upgraded all dependencies to latest version

5.0.0

• 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

4.4.2

• Remove dependency on dirs crate due to MPL licensing in its tree. Use home crate instead. (@​Xaeroxe)

4.4.1

• Add tilde expansion for home directory (@​Xaeroxe)
• Swap out libc for rustix, forbid unsafe (@​notgull)

Commits

• 7c8a898 bump patch version
• e95dca2 remove dependency on once_cell
• 071683c Use winsafe over windows-sys, and reduce dependency on rustix
• 96a8004 Upgrade deps, move to 6.0.0
• f50675a Prep 5.0.0 release
• e776ff0 Return appropriate error if path list defined and empty
• 70d2d1c Null terminate string for windows api
• 5c6208b Change how unit test gets current exe
• 6a027d1 Add unit test for extensionless Windows executable
• 323155d Bump version
• Additional commits viewable in compare view

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