Update axum-test requirement from 12.1.0 to 14.2.2 (#57)

Updates the requirements on
[axum-test](https://github.com/JosephLenton/axum-test) to permit the
latest version.
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engine/Cargo.toml

@@ -16,7 +16,7 @@ path = "src/main.rs"
 [dependencies]
 async-trait = "0.1.73"
 axum = "0.6.18"
-axum-test = "12.1.0"
+axum-test = "14.2.2"
 env_logger = "0.10.0"
 hyper = { version = "0.14.27", features = ["http1"] }
 log = "0.4.19"