build(deps): update which requirement from 7.0.1 to 8.0.0

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](harryfei/which-rs@7.0.1...8.0.0)

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

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

Author: dependabot[bot]

crates/shim/Cargo.toml

@@ -28,7 +28,7 @@ name = "windows-log-reader"
 path = "examples/windows_log_reader.rs"
 
 [dependencies]
-which = "7.0.1"
+which = "8.0.0"
 containerd-shim-protos = { path = "../shim-protos", version = "0.10.0" }
 go-flag = "0.1.0"
 lazy_static = "1.4.0"