Bump serial_test from 0.5.1 to 0.6.0

Bumps [serial_test](https://github.com/palfrey/serial_test) from 0.5.1 to 0.6.0.
- [Release notes](https://github.com/palfrey/serial_test/releases)
- [Commits](https://github.com/palfrey/serial_test/compare/v0.5.1...v0.6.0)

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

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

Cargo.toml

@@ -85,7 +85,7 @@ features = ["suggestions", "color", "wrap_help"]
 
 [dev-dependencies]
 assert_cmd = "2.0.4"
-serial_test = "0.5.1"
+serial_test = "0.6.0"
 predicates = "2.1.1"
 wait-timeout = "0.2.0"
 tempfile = "3.3.0"