Fix Redirect behavior

See https://stackoverflow.com/questions/68217426/elsa-workflows-redirect-http-action-behavior

src/activities/Elsa.Activities.Http/Activities/Redirect/Redirect.cs

@@ -42,7 +42,7 @@ namespace Elsa.Activities.Http
             if (response.HasStarted)
                 return Fault(T["Response has already started"]!);
 
-            return new RedirectResult(_httpContextAccessor, Location, Permanent);
+            return Combine(new RedirectResult(_httpContextAccessor, Location, Permanent), Done());
         }
     }
 }