refactor: Change default DNS Servers

Author: HMBSbige

shadowsocks-csharp/Model/Configuration.cs

@@ -477,10 +477,11 @@ public Configuration()
             LangName = string.Empty;
             DnsClients = new List<DnsClient>
             {
-                new(DnsType.DnsOverTls) {DnsServer = @"1.1.1.1"},
-                new(DnsType.Default) {DnsServer = @"1.1.1.1"},
-                new(DnsType.DnsOverTls),
-                new(DnsType.Default)
+                new(DnsType.DnsOverTls) { DnsServer = @"208.67.222.222" },
+                new(DnsType.DnsOverTls) { DnsServer = @"208.67.220.220" },
+                new(DnsType.DnsOverTls) { DnsServer = @"1.1.1.1" },
+                new(DnsType.DnsOverTls) { DnsServer = @"1.0.0.1" },
+                new(DnsType.DnsOverTls) { DnsServer = @"1.12.12.12" },
             };
             ServerSubscribes = new List<ServerSubscribe>();
             PortMap = new Dictionary<string, PortMapConfig>();

shadowsocks-csharp/Model/DnsClient.cs

@@ -127,9 +127,9 @@ public bool IsUdpEnabled
     #region Ignore
 
     private IPAddress? _ip;
-    public const string DefaultDnsServer = @"8.8.8.8";
+    public const string DefaultDnsServer = @"208.67.222.222";
     public const ushort DefaultPort = 53;
-    public const string DefaultTlsDnsServer = @"dns.google";
+    public const string DefaultTlsDnsServer = @"208.67.222.222";
     public const ushort DefaultTlsPort = 853;
 
     #endregion