fix(deps): update rust crate shuttle-axum to 0.51.0

Author: renovate[bot]

Cargo.toml

@@ -31,7 +31,7 @@ tracing = "0.1.40"
 tracing-opentelemetry = "0.23.0"
 tracing-subscriber = "0.3.18"
 shuttle-runtime = "0.49.0"
-shuttle-axum = "0.39.0"
+shuttle-axum = "0.51.0"
 async-trait = "0.1"
 
 [build-dependencies]