Celtic will be on the lookout for a new goalkeeper this summer once Joe Hart hangs up his gloves after Saturday’s Scottish Cup final. Rangers await at Hampden on the final day of the season before the Englishman will say goodbye for the last time following three years of service at Parkhead. Brendan Rodgers will be tasked with finding a suitable replacement for Hart, which won’t be an easy task, factoring in his leadership qualities, experiences and insatiable hunger for trophies. Nevertheless, all good things come to an end, and when one door closes, another will open for his successor to tak…