SIP008 Online configuration update doesn't work with TLS1.3.

Describe the bug

When SIP008 configuration server only allows TLS1.3, shadowsocks-windows fails to establish connection.

Environment

Shadowsocks client version: 4.4.1.0
OS version: Windows 10 LTSC 2021 with 21H2
.NET version: v4.0

Steps you have tried

After I discovered this issue, I updated the SSL/TLS configuration from my service provider Cloudflare to allow TLS1.2 connections, and then shadowsocks-windows successfully connected to the server.

What did you expect to see?

I think this feature should work with TLS1.3.

What did you see instead?

SIP002 Online configuration update doesn't work with TLS1.3.

Config and error log in detail (with all sensitive info masked)

2022-05-2x xx:xx:xx.xxxx|WARN|Shadowsocks.Controller.ShadowsocksController|System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.WebException: The request was aborted: Could not create SSL/TLS secure channel.
   at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
   at System.Net.Http.HttpClientHandler.GetResponseCallback(IAsyncResult ar)
   --- End of inner exception stack trace ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Shadowsocks.Controller.Service.OnlineConfigResolver.<GetOnline>d__0.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Shadowsocks.Controller.ShadowsocksController.<UpdateOnlineConfigInternal>d__109.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Shadowsocks.Controller.ShadowsocksController.<UpdateAllOnlineConfig>d__111.MoveNext()
...

shadowsocks / shadowsocks-windows