logpolicy: remove deprecated DualStack directive.
@@ -253,7 +253,6 @@ func newLogtailTransport(host string) *http.Transport {
nd := netns.Dialer()
nd.Timeout = 30 * time.Second
nd.KeepAlive = 30 * time.Second
- nd.DualStack = true
t0 := time.Now()
c, err := nd.DialContext(ctx, netw, addr)
d := time.Since(t0).Round(time.Millisecond)
