Update which requirement from 4.2 to 5.0

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

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

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

Author: dependabot[bot]

Cargo.toml

@@ -31,7 +31,7 @@ tokio = { version = "1.1", features = ["fs", "sync"] }
 tracing = "0.1.29"
 tracing-futures = "0.2.5"
 url = "2"
-which = "4.2"
+which = "5.0"
 
 [dev-dependencies]
 env_logger = "0.10"