chore(swarm): use tokio instead of async_std

swarm/Cargo.toml

@@ -38,7 +38,6 @@ async-std = ["dep:async-std"]
 wasm-bindgen = ["dep:wasm-bindgen-futures", "dep:getrandom"]
 
 [dev-dependencies]
-async-std = { version = "1.6.2", features = ["attributes"] }
 either = "1.11.0"
 futures = { workspace = true }
 libp2p-identify = { path = "../protocols/identify" }                # Using `path` here because this is a cyclic dev-dependency which otherwise breaks releasing.

swarm/tests/connection_close.rs

@@ -12,7 +12,7 @@ use libp2p_swarm::{
 };
 use libp2p_swarm_test::SwarmExt;
 
-#[async_std::test]
+#[tokio::test]
 async fn sends_remaining_events_to_behaviour_on_connection_close() {
     let mut swarm1 = Swarm::new_ephemeral(|_| Behaviour::new(3));
     let mut swarm2 = Swarm::new_ephemeral(|_| Behaviour::new(3));

swarm/tests/listener.rs

@@ -17,7 +17,7 @@ use libp2p_swarm::{
 };
 use libp2p_swarm_test::SwarmExt;
 
-#[async_std::test]
+#[tokio::test]
 async fn behaviour_listener() {
     let mut swarm = Swarm::new_ephemeral(|_| Behaviour::default());
     let addr: Multiaddr = Protocol::Memory(0).into();