By Lucia Mutikani WASHINGTON (Reuters) – U.S. retail sales unexpectedly rebounded in August as Americans ramped up purchases of motor vehicles and dined out more amid lower gasoline prices, but demand is cooling as the Federal Reserve aggressively raises interest rates to fight inflation. Consumer spending, however, is likely to remain supported by persistent strength in the labor market, with other data on Thursday showing the number of people filing new claims for unemployment benefits last week fell to the lowest level in more than three months. The data was among the last batch of reports …