* SPDR Gold Trust GLD, the world's largest gold-backed exchange-traded fund, said its holdings fell 0.3% to 1,049.56 tonnes on Monday. June 22 (Reuters) - Gold prices edged higher on Tuesday, as a pullback in the dollar lifted demand for the safe-haven metal, ahead of U.S. Federal Reserve Chairman Jerome Powell's testimony to Congress later in the day. US/ * The U.S. economy continues to show "sustained improvement" from the impact of the COVID-19 pandemic and ongoing job market gains, but inflation has "increased notably in recent months," Powell said in prepared testimony for a congressional hearing on Tuesday.