chore(deps): bump serial_test from 3.2.0 to 3.4.0 (#25022)

Bumps [serial_test](https://github.com/palfrey/serial_test) from 3.2.0 to 3.4.0.
- [Release notes](https://github.com/palfrey/serial_test/releases)
- [Commits](palfrey/serial_test@v3.2.0...v3.4.0)

---
updated-dependencies:
- dependency-name: serial_test
  dependency-version: 3.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Cargo.lock

@@ -214,7 +214,7 @@ vector-vrl-category = { path = "lib/vector-vrl/category" }
 vector-vrl-functions = { path = "lib/vector-vrl/functions", default-features = false }
 vrl = { git = "https://github.com/vectordotdev/vrl.git", branch = "main", default-features = false, features = ["arbitrary", "cli", "test", "test_framework", "stdlib-base"] }
 mock_instant = { version = "0.6" }
-serial_test = { version = "3.2" }
+serial_test = { version = "3.4" }
 strum = { version = "0.28", features = ["derive"] }
 
 [dependencies]