By Gertrude Chavez-Dreyfuss NEW YORK (Reuters) – Sterling fell sharply against the U.S. dollar on Friday after British Prime Minister Liz Truss fired her finance minister and scrapped parts of their economic package that has caused havoc in UK financial markets. The dollar, on the other hand, continued its march higher against a beleaguered yen, hitting a fresh 32-year peak of 148.86. It was last up 1% at 148.67 yen. The dollar was on track to post its best weekly performance against the Japanese unit since roughly mid-August. Traders are once again on the lookout for any potential action from…