fix KeepAliveInterval cause crash

EVCB_OCPP.WSServer/Service/WsService/OcppWebsocketService.cs

@@ -21,7 +21,7 @@ public static partial class AppExtention
     {
         webApplication.UseWebSockets(new WebSocketOptions()
         {
-            KeepAliveInterval = TimeSpan.MaxValue
+            KeepAliveInterval = TimeSpan.FromDays(1)
         });
 
         webApplication.Use(async (context, next) =>

version.txt

@@ -1 +1 @@
-Docker_v1.1.19
+Docker_v1.1.20