build: Bump serde_json from 1.0.115 to 1.0.120

Bumps [serde_json](https://github.com/serde-rs/json) from 1.0.115 to 1.0.120.
- [Release notes](https://github.com/serde-rs/json/releases)
- [Commits](https://github.com/serde-rs/json/compare/v1.0.115...v1.0.120)

---
updated-dependencies:
- dependency-name: serde_json
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

test_infra/Cargo.toml

@@ -10,7 +10,7 @@ epoll = "4.3.3"
 libc = "0.2.153"
 once_cell = "1.19.0"
 serde = { version = "1.0.197", features = ["derive", "rc"] }
-serde_json = "1.0.115"
+serde_json = "1.0.120"
 ssh2 = { version = "0.9.4", features = ["vendored-openssl"] }
 vmm-sys-util = "0.12.1"
 wait-timeout = "0.2.0"