Port to event-listener v4

While the eventual event-listener v5 might take a while to be released,
in the meantime, let's port to the latest stable version so to have all
smol-rs crates depend on the same event-listener and hence not dragging
along 2 versions of it in the dependend projects.

Cargo.toml

@@ -22,8 +22,8 @@ name = "broadcast_bench"
 [features]
 
 [dependencies]
-event-listener = "3"
-event-listener-strategy = "0.1.0"
+event-listener = "4"
+event-listener-strategy = "0.4.0"
 futures-core = "0.3.21"
 
 [dev-dependencies]

src/lib.rs

@@ -1610,7 +1610,7 @@ impl<'a, T: Clone> EventListenerFuture for SendInner<'a, T> {
     type Output = Result<Option<T>, SendError<T>>;
 
     fn poll_with_strategy<'x, S: event_listener_strategy::Strategy<'x>>(
-        self: Pin<&'x mut Self>,
+        self: Pin<&mut Self>,
         strategy: &mut S,
         context: &mut S::Context,
     ) -> Poll<Self::Output> {
@@ -1677,7 +1677,7 @@ impl<'a, T: Clone> EventListenerFuture for RecvInner<'a, T> {
     type Output = Result<T, RecvError>;
 
     fn poll_with_strategy<'x, S: event_listener_strategy::Strategy<'x>>(
-        self: Pin<&'x mut Self>,
+        self: Pin<&mut Self>,
         strategy: &mut S,
         context: &mut S::Context,
     ) -> Poll<Self::Output> {