build(deps): update which requirement in /crates/volta-core

Updates the requirements on [which](https://github.com/harryfei/which-rs) to permit the latest version.
- [Release notes](https://github.com/harryfei/which-rs/releases)
- [Changelog](https://github.com/harryfei/which-rs/blob/master/CHANGELOG.md)
- [Commits](harryfei/which-rs@4.2.5...6.0.1)

---
updated-dependencies:
- dependency-name: which
  dependency-type: direct:production
...

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

Author: dependabot[bot]

crates/volta-core/Cargo.toml

@@ -52,7 +52,7 @@ chain-map = "0.1.0"
 indexmap = "2.2.6"
 retry = "2"
 fs2 = "0.4.3"
-which = "4.2.5"
+which = "6.0.1"
 
 [target.'cfg(windows)'.dependencies]
 winreg = "0.52.0"