List down all of the winning teams' IDs that played in St George's Park.
winning teams' refers to Match_Winner; played in St George's Park refers to Venue_Name like 'St George%'
SELECT T2.Match_Winner FROM Venue AS T1 INNER JOIN Match AS T2 ON T1.Venue_Id = T2.Venue_Id WHERE T1.Venue_Name LIKE 'St George%'