fix IPv6 connection failures with Happy Eyeballs (RFC 8305)

Implement a custom WebSocketTransport that races IPv6 and IPv4 connections
with a 250ms head start for IPv6, matching browser behavior. This prevents
broken IPv6 from blocking all relay connections indefinitely.

This is a temporary fix until the upstream async-wsocket PR is merged:
https://github.com/shadowylab/async-wsocket/pull/42

1 files changed, 2 insertions, 0 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 8d63861..97aa90a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1538,6 +1538,7 @@ dependencies = [
  "anyhow",
  "assert_cmd",
  "async-trait",
+ "async-wsocket",
  "auth-git2",
  "chacha20poly1305",
  "chrono",
@@ -1568,6 +1569,7 @@ dependencies = [
  "serial_test",
  "test_utils",
  "tokio",
+ "tokio-tungstenite 0.26.2",
  "urlencoding",
  "zeroize",
 ]