By Karen Brettell NEW YORK (Reuters) – The dollar slipped from 20-year highs against a basket of currencies on Friday but remained on track for the best month in seven years as concerns about the global economy and a hawkish Federal Reserve bolstered demand for the greenback. The dollar hit a 20-year high against the yen on Thursday, as the Japanese currency was hurt by dovish Bank of Japan policy. It also hit a five-year high against the euro, which has dropped sharply since Russia’s invasion of Ukraine, with investors concerned about Europe’s energy security, inflation and growth. “The broad…