remove unused dependencies

examples/simple_producer/Cargo.toml

@@ -8,10 +8,7 @@ api = { path = "../../api" }
 tokio = { version = "1.43.0", features = ["rt-multi-thread", "signal", "time", "macros"] }
 chrono = "0.4.39"
 num-traits = "0.2.19"
-tokio-tungstenite = { version = "0.28.0", features = ["rustls-tls-native-roots"] }
 anyhow = "1.0.100"
 futures-util = "0.3.31"
-serde_json = "1.0.145"
 uuid = { version = "1.19.0", features = ["v4"] }
 tokio-util = "0.7.17"
-tokio-stream = "0.1.17"