fix 调整到3秒时效

Src/Dlhis.Middle/Services/Implements/HealthcheckService.cs

@@ -23,7 +23,7 @@ public class HealthCheckService : IHealthCheckService
 
     public async Task DoHealthCheckAsync()
     {
-        var cancellationTokenSource = new CancellationTokenSource(1000);
+        var cancellationTokenSource = new CancellationTokenSource(3000);
         var tcpClient = new TcpClient();
 
         try
@@ -61,8 +61,6 @@ public class HealthCheckService : IHealthCheckService
         {
             _logger.LogError("fail cause :{reason}", ex.Message);
             _isOffline = true;
-
-            await Task.Delay(5000);
         }
     }
 }