build(deps): bump which from 5.0.0 to 6.0.0

Bumps [which](https://github.com/harryfei/which-rs) from 5.0.0 to 6.0.0.
- [Release notes](https://github.com/harryfei/which-rs/releases)
- [Changelog](https://github.com/harryfei/which-rs/blob/master/CHANGELOG.md)
- [Commits](harryfei/which-rs@5.0.0...6.0.0)

---
updated-dependencies:
- dependency-name: which
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.lock

@@ -33,7 +33,7 @@ cfg-if = "1.0"
 mockito = { version = "0.31.1", optional = true }
 test-support = { path = "crates/test-support" }
 textwrap = "0.16.0"
-which = "5.0.0"
+which = "6.0.0"
 dirs = "5.0.1"
 volta-migrate = { path = "crates/volta-migrate" }