Update procfs requirement from ^0.8 to ^0.9 (#368)

Updates the requirements on [procfs](https://github.com/eminence/procfs) to permit the latest version.
- [Release notes](https://github.com/eminence/procfs/releases)
- [Commits](eminence/procfs@v0.8.0...v0.9.0)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Cargo.toml

@@ -36,7 +36,7 @@ reqwest = { version = "^0.10", features = ["blocking"], optional = true }
 thiserror = "^1.0"
 
 [target.'cfg(target_os = "linux")'.dependencies]
-procfs = { version = "^0.8", optional = true, default-features = false }
+procfs = { version = "^0.9", optional = true, default-features = false }
 
 [dev-dependencies]
 criterion = "0.3"