Bump serial_test from 0.5.0 to 0.5.1

Bumps [serial_test](https://github.com/palfrey/serial_test) from 0.5.0 to 0.5.1.
- [Release notes](https://github.com/palfrey/serial_test/releases)
- [Commits](palfrey/serial_test@v0.5.0...v0.5.1)

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

Author: dependabot-preview[bot]

Cargo.lock

@@ -23,4 +23,4 @@ url = "2.2"
 [dev-dependencies]
 tempfile = "3.1"
 invalidstring = { path = "../invalidstring", version = "0.1" }
-serial_test = "0.5.0"
+serial_test = "0.5.1"