build(deps): update arbiter-engine requirement from 0.3.1 to 0.4.0

Updates the requirements on [arbiter-engine](https://github.com/primitivefinance/arbiter) to permit the latest version.
- [Release notes](https://github.com/primitivefinance/arbiter/releases)
- [Changelog](https://github.com/primitivefinance/arbiter/blob/main/CHANGELOG.md)
- [Commits](anthias-labs/arbiter@arbiter-engine-v0.3.1...arbiter-engine-v0.3.2)

---
updated-dependencies:
- dependency-name: arbiter-engine
  dependency-type: direct:production
...

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

Cargo.toml

@@ -9,7 +9,7 @@ tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }
 arbiter-bindings = "0.1.6"
 arbiter-core = "0.10.3"
 arbiter-macros = "0.1.3"
-arbiter-engine = "0.3.1"
+arbiter-engine = "0.4.0"
 tokio = { version = "1.36.0", features = ["full"] }
 ethers = "2.0.10"
 serde = { version = "1.0.189", features = ["derive"] }