chore(core): remove deprecated symbols

Pull-Request: #4736.

Author: thomaseizinger

core/CHANGELOG.md

@@ -2,6 +2,8 @@
 
 - Remove blanket-impl of `{In,Out}boundUpgrade` for `{In,Out}boundConnectionUpgrade`.
   See [PR 4695](https://github.com/libp2p/rust-libp2p/pull/4695).
+- Remove deprecated functions from `ListenerId`.
+  See [PR 4736](https://github.com/libp2p/rust-libp2p/pull/4736).
 
 ## 0.40.1
 

core/src/transport.rs

@@ -250,23 +250,10 @@ pub trait Transport {
 pub struct ListenerId(usize);
 
 impl ListenerId {
-    #[deprecated(note = "Renamed to ` ListenerId::next`.")]
-    #[allow(clippy::new_without_default)]
-    /// Creates a new `ListenerId`.
-    pub fn new() -> Self {
-        ListenerId::next()
-    }
-
     /// Creates a new `ListenerId`.
     pub fn next() -> Self {
         ListenerId(NEXT_LISTENER_ID.fetch_add(1, Ordering::SeqCst))
     }
-
-    #[deprecated(note = "Use ` ListenerId::next` instead.")]
-    #[allow(clippy::should_implement_trait)]
-    pub fn default() -> Self {
-        Self::next()
-    }
 }
 
 /// Event produced by [`Transport`]s.