Fix code for .NET 8 new warnings

Author: weshaggard

src/dotnet/APIView/APIViewWeb/Account/TestAuthHandler.cs

@@ -11,7 +11,7 @@ namespace APIViewWeb.Account
 {
     public class TestAuthHandler :  AuthenticationHandler<AuthenticationSchemeOptions>
     {
-        public TestAuthHandler(IOptionsMonitor<AuthenticationSchemeOptions> options, ILoggerFactory logger, UrlEncoder encoder, ISystemClock clock) : base(options, logger, encoder, clock) { }
+        public TestAuthHandler(IOptionsMonitor<AuthenticationSchemeOptions> options, ILoggerFactory logger, UrlEncoder encoder) : base(options, logger, encoder) { }
 
         protected override Task<AuthenticateResult> HandleAuthenticateAsync()
         {

src/dotnet/APIView/APIViewWeb/Extensions/HttpExtensions.cs

@@ -13,8 +13,8 @@ public static void AddPaginationHeader(this HttpResponse response, PaginationHea
             {
                 PropertyNamingPolicy = JsonNamingPolicy.CamelCase
             };
-            response.Headers.Add("Pagination", JsonSerializer.Serialize(header, options));
-            response.Headers.Add("Access-Control-Expose-Headers", "Pagination");
+            response.Headers.Append("Pagination", JsonSerializer.Serialize(header, options));
+            response.Headers.Append("Access-Control-Expose-Headers", "Pagination");
         }
     }
 }