fix: Fixed duration calculation for Sentry.Hangfire crons checkIn (#3420

)

src/Sentry.Hangfire/SentryServerFilter.cs

@@ -51,7 +51,7 @@ public void OnPerformed(PerformedContext context)
         }
 
         var status = context.Exception is null ? CheckInStatus.Ok : CheckInStatus.Error;
-        var duration = context.BackgroundJob.CreatedAt - DateTime.Now;
+        var duration = DateTime.UtcNow - context.BackgroundJob.CreatedAt;
 
         _ = _hub.CaptureCheckIn(monitorSlug, status, checkInId, duration: duration);
     }