Bump procfs from 0.11.1 to 0.12.0 in /src/agent (#1519)

Bumps [procfs](https://github.com/eminence/procfs) from 0.11.1 to 0.12.0.
- [Release notes](https://github.com/eminence/procfs/releases)
- [Commits](eminence/procfs@v0.11.1...v0.12.0)

---
updated-dependencies:
- dependency-name: procfs
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Marc Greisen <marc@greisen.org>

src/agent/coverage/Cargo.toml

@@ -34,7 +34,7 @@ winapi = "0.3"
 
 [target.'cfg(target_os = "linux")'.dependencies]
 pete = "0.8"
-procfs = "0.11"
+procfs = "0.12"
 
 [dev-dependencies]
 env_logger = "0.9"