GDANSK, Poland — Steven Dubois earned gold in the men's 500 metres and Canada won the 5,000-metre relay on Sunday in the final event of the ISU World Cup short-track speedskating season. Dubois, from Terrebonne, Que., picked up his second individual medal of the competition with a decisive victory in the 500 metres. He finished in 40.303 seconds for his first 500-metre World Cup gold medal of the season, finishing ahead of Denis Nikisha of Kazakhstan (41.051) and Michal Niewinski of Poland (41.1