Bump process_control from 3.1.0 to 3.4.0 in /src/agent

Bumps [process_control](https://github.com/dylni/process_control) from 3.1.0 to 3.4.0.
- [Release notes](https://github.com/dylni/process_control/releases)
- [Commits](dylni/process_control@3.1.0...3.4.0)

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

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

Author: dependabot[bot]

src/agent/Cargo.lock

@@ -37,7 +37,7 @@ storage-queue = { path = "../storage-queue" }
 strum = "0.23"
 strum_macros = "0.23"
 tempfile = "3.2"
-process_control = "3.0"
+process_control = "3.4"
 reqwest-retry = { path = "../reqwest-retry"}
 onefuzz-telemetry = { path = "../onefuzz-telemetry"}
 stacktrace-parser = { path = "../stacktrace-parser" }