build(deps): bump which from 4.2.2 to 5.0.0

Bumps [which](https://github.com/harryfei/which-rs) from 4.2.2 to 5.0.0.
- [Release notes](https://github.com/harryfei/which-rs/releases)
- [Changelog](https://github.com/harryfei/which-rs/blob/master/CHANGELOG.md)
- [Commits](harryfei/which-rs@4.2.2...5.0.0)

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

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

src/build-tools/Cargo.toml

@@ -9,7 +9,7 @@ publish = false
 [dependencies]
 cfg-if = "1.0.0"
 protobuf-src = { version = "2.0.0", optional = true }
-which = "4"
+which = "5"
 workspace-hack = { version = "0.0.0", path = "../workspace-hack", optional = true }
 
 [lints]