Update which requirement from 5.0 to 8.0

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](https://github.com/harryfei/which-rs/compare/5.0.0...8.0.0)

---
updated-dependencies:
- dependency-name: which
  dependency-version: 8.0.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -25,7 +25,7 @@ crossterm = "0.27"
 tokio = { version = "1.35", features = ["time", "rt-multi-thread", "macros", "signal", "sync"] }
 
 # Process execution
-which = "5.0"
+which = "8.0"
 
 # Parsing
 nom = "7.1"