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>

vm-migration/Cargo.toml

@@ -7,7 +7,7 @@ version = "0.1.0"
 [dependencies]
 anyhow = "1.0.81"
 serde = { version = "1.0.197", features = ["derive", "rc"] }
-serde_json = "1.0.115"
+serde_json = "1.0.120"
 thiserror = "1.0.62"
 vm-memory = { version = "0.14.1", features = [
   "backend-atomic",