Bump serial_test from 2.0.0 to 3.0.0

Bumps [serial_test](https://github.com/palfrey/serial_test) from 2.0.0 to 3.0.0.
- [Release notes](https://github.com/palfrey/serial_test/releases)
- [Commits](palfrey/serial_test@v2.0.0...v3.0.0)

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

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

Cargo.toml

@@ -90,7 +90,7 @@ plist = "1.5.1"
 [dev-dependencies]
 assert_cmd = "2.0.12"
 expect-test = "1.4.1"
-serial_test = { version = "2.0.0", default-features = false }
+serial_test = { version = "3.0.0", default-features = false }
 predicates = "3.0.4"
 wait-timeout = "0.2.0"
 tempfile = "3.8.1"