chore(dns): upgrade dependency from v2.0.0-rc7 to v2.0.0-rc8

- do not log dial error twice
- DNS subserver shuts down without waiting for connections to finish (UDP server would hang sometimes)
- DNS over TLS dialer uses tls.Dialer instead of wrapping connection with tls.Client
- connection type is just `tls` instead of `dns over tls` to reduce repetition in logs
- exchange errors contain the request question in their context

internal/dns/settings.go

@@ -29,7 +29,6 @@ func buildDoTSettings(settings settings.DNS,
 	serverSettings.Logger = logger
 
 	var dotSettings dot.Settings
-	dotSettings.Warner = logger
 	providersData := provider.NewProviders()
 	dotSettings.UpstreamResolvers = make([]provider.Provider, len(settings.DoT.Providers))
 	for i := range settings.DoT.Providers {