fix: lock tournament winner submissions

othello/apps/games/models.py

@@ -27,7 +27,7 @@ def latest(self, **kwargs: Any) -> "models.query.QuerySet[Submission]":
         """
         Returns a set of all the latest submissions for all users
         """
-        return self.filter(**kwargs).distinct("user").order_by("user", "-created_at")
+        return self.filter(**kwargs).distinct("user").order_by("user", "-tournament_win_year", "-created_at")
 
 
 class Submission(models.Model):