Update shuttle-service requirement from 0.39.0 to 0.42.0

Updates the requirements on [shuttle-service](https://github.com/shuttle-hq/shuttle) to permit the latest version.
- [Release notes](https://github.com/shuttle-hq/shuttle/releases)
- [Changelog](https://github.com/shuttle-hq/shuttle/blob/main/CHANGELOG.md)
- [Commits](shuttle-hq/shuttle@v0.39.0...v0.42.0)

---
updated-dependencies:
- dependency-name: shuttle-service
  dependency-type: direct:production
...

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

Cargo.toml

@@ -7,7 +7,7 @@ edition = "2021"
 async-trait = "0.1.77"
 diesel-async = { version = "0.4.1", features = ["postgres"] }
 serde = { version = "1.0.197", features = ["derive"] }
-shuttle-service = { version = "0.39.0", default-features = false }
+shuttle-service = { version = "0.42.0", default-features = false }
 
 [features]
 bb8 = ["diesel-async/bb8"]