switch kestrel back to libuv til bugs are fixed

src/Icons/Program.cs

@@ -11,6 +11,8 @@ namespace Bit.Icons
             WebHost
                 .CreateDefaultBuilder(args)
                 .UseStartup<Startup>()
+                // ref: https://github.com/aspnet/KestrelHttpServer/issues/2694
+                .UseLibuv()
                 .Build()
                 .Run();
         }