Update Issue.cs

Author: pwelter34

test/FluentRest.Tests/GitHub/Models/Issue.cs

@@ -22,7 +22,7 @@ public class Issue
     public string HtmlUrl { get; set; }
 
     [JsonPropertyName("id")]
-    public int Id { get; set; }
+    public long Id { get; set; }
 
     [JsonPropertyName("number")]
     public int Number { get; set; }