Remove unnecessary tracing_core dependency

Cargo.lock

@@ -3514,7 +3514,6 @@ dependencies = [
  "tokio-tungstenite",
  "toml",
  "tracing",
- "tracing-core",
  "tracing-futures",
  "tracing-log",
  "tracing-subscriber",

swap/Cargo.toml

@@ -57,7 +57,6 @@ tokio = { version = "1.0", features = ["rt-multi-thread", "time", "macros", "syn
 tokio-tungstenite = { version = "0.13", features = [ "tls" ] }
 toml = "0.5"
 tracing = { version = "0.1", features = ["attributes"] }
-tracing-core = "0.1"
 tracing-futures = { version = "0.2", features = ["std-future", "futures-03"] }
 tracing-log = "0.1"
 tracing-subscriber = { version = "0.2", default-features = false, features = ["fmt", "ansi", "env-filter"] }

swap/tests/testutils/mod.rs

@@ -27,7 +27,7 @@ use swap::{
 use tempfile::tempdir;
 use testcontainers::{clients::Cli, Container, Docker, RunArgs};
 use tokio::{sync::mpsc, task::JoinHandle, time::interval};
-use tracing_core::dispatcher::DefaultGuard;
+use tracing::dispatcher::DefaultGuard;
 use tracing_log::LogTracer;
 use url::Url;
 use uuid::Uuid;