deps: bump tokio from 1.39.3 to 1.40.0 (#594)

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.39.3 to 1.40.0.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-1.39.3...tokio-1.40.0)

---
updated-dependencies:
- dependency-name: tokio
  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>

Cargo.toml

@@ -24,7 +24,7 @@ pretty_assertions = "1.4.0"
 env_logger = "0.10.2"
 serde = "1.0.209"
 serde_repr = "0.1.19"
-tokio = { version = "1.39.3", features = ["fs", "rt", "macros"] }
+tokio = { version = "1.40.0", features = ["fs", "rt", "macros"] }
 
 # workspace-local
 zinnia_runtime = { version = "0.20.2", path = "./runtime" }