Update testcontainers requirement from 0.17.0 to 0.18.0 in /rust-tokio

Updates the requirements on [testcontainers](https://github.com/testcontainers/testcontainers-rs) to permit the latest version.
- [Release notes](https://github.com/testcontainers/testcontainers-rs/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-rs/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-rs@0.17.0...0.18.0)

---
updated-dependencies:
- dependency-name: testcontainers
  dependency-type: direct:production
...

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

rust-tokio/Cargo.toml

@@ -6,7 +6,7 @@ rust-version = "1.78"
 
 [dependencies]
 reqwest = "0.12.4"
-testcontainers = "0.17.0"
+testcontainers = "0.18.0"
 tokio = { version = "1.37.0", features = ["rt-multi-thread", "macros"] }
 rand = "0.8.5"
 sha2 = "0.10.8"