chore(quic): remove deprecated symbols

Pull-Request: #4738.

Author: thomaseizinger

transports/quic/CHANGELOG.md

@@ -3,6 +3,8 @@
 - Improve hole-punch timing.
   This should improve success rates for hole-punching QUIC connections.
   See [PR 4549](https://github.com/libp2p/rust-libp2p/pull/4549).
+- Remove deprecated `Error::EndpointDriverCrashed` variant.
+  See [PR 4738](https://github.com/libp2p/rust-libp2p/pull/4738).
 
 ## 0.9.3
 

transports/quic/src/lib.rs

@@ -90,11 +90,6 @@ pub enum Error {
     #[error(transparent)]
     Io(#[from] std::io::Error),
 
-    /// The task to drive a quic endpoint has crashed.
-    #[deprecated(since = "0.9.3", note = "No longer emitted")]
-    #[error("Endpoint driver crashed")]
-    EndpointDriverCrashed,
-
     /// The [`Connecting`] future timed out.
     #[error("Handshake with the remote timed out.")]
     HandshakeTimedOut,