Remove unnecessary code

DiscordChatExporter.Core/Utils/Extensions/HttpExtensions.cs

@@ -1,8 +1,4 @@
-using System.Globalization;
-using System.Net;
-using System.Net.Http;
-using System.Net.Http.Headers;
-using System.Text.RegularExpressions;
+using System.Net.Http.Headers;
 
 namespace DiscordChatExporter.Core.Utils.Extensions;
 
@@ -12,13 +8,4 @@ public static class HttpExtensions
         headers.TryGetValues(name, out var values)
             ? string.Concat(values)
             : null;
-
-    public static HttpStatusCode? TryGetStatusCode(this HttpRequestException ex) =>
-        // This is extremely frail, but there's no other way
-        Regex
-            .Match(ex.Message, @": (\d+) \(")
-            .Groups[1]
-            .Value
-            .NullIfWhiteSpace()?
-            .Pipe(s => (HttpStatusCode) int.Parse(s, CultureInfo.InvariantCulture));
 }

DiscordChatExporter.Core/Utils/Http.cs

@@ -23,7 +23,7 @@ public static class Http
     private static bool IsRetryableException(Exception exception) =>
         exception.GetSelfAndChildren().Any(ex =>
             ex is TimeoutException or SocketException or AuthenticationException ||
-            ex is HttpRequestException hrex && IsRetryableStatusCode(hrex.TryGetStatusCode() ?? HttpStatusCode.OK)
+            ex is HttpRequestException hrex && IsRetryableStatusCode(hrex.StatusCode ?? HttpStatusCode.OK)
         );
 
     public static IAsyncPolicy ResiliencePolicy { get; } =