Change Usage of WebClient() to HttpClient()

[jeremy-farrance]

I haven't researched this well, but the Recaptcha.cs code is still using WebClient() and should be updated to using System.Net.Http and then change the code to something like:

Note: this is an example from our Cloudflare Turnstile implementation, NOT intended as the way to update the existing Google reCaptcha code.

var client = new HttpClient();

dynamic jsonObject = new { secret = privateKey, response = encodedResponse};
var content = new StringContent(JsonConvert.SerializeObject(jsonObject), System.Text.Encoding.UTF8, "application/json");
      
//URL updated per https://developers.cloudflare.com/turnstile/migration/recaptcha/
var CloudflareReply = await client.PostAsync("https://challenges.cloudflare.com/turnstile/v0/siteverify", content);

[iJungleboy]

@ropalko this seems to be correct, WebClient seems deprecated and we should use HttpClient.

[ropalko]

Update web client to httpclient. Thank you for the hint =)

[iJungleboy]

@ropalko completed - but not published? or is that in a few mins ;) ?

[ropalko]

Also made a new release for 2sxc 19