build(deps): bump serial_test from 2.0.0 to 3.1.1

Bumps [serial_test](https://github.com/palfrey/serial_test) from 2.0.0 to 3.1.1.
- [Release notes](https://github.com/palfrey/serial_test/releases)
- [Commits](palfrey/serial_test@v2.0.0...v3.1.1)

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

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

Author: dependabot[bot]

Cargo.lock

@@ -40,5 +40,5 @@ float_eq = "^1"
 tempfile = "3"
 assert_cmd = "^2"
 predicates = "^3"
-serial_test = "2"
+serial_test = "3"
 rand = "0.8.5"