By David Lawder WASHINGTON (Reuters) – The U.S. government on Friday reported that its fiscal 2022 budget deficit plunged by half from a year earlier to $1.375 trillion, due to fading COVID-19 relief spending and record revenues fueled by a hot economy, but student loan forgiveness costs limited the reduction. The U.S. Treasury said the $1.400 trillion reduction in the deficit was still the largest-ever single-year improvement in the U.S. fiscal position as receipts hit a record $4.896 trillion, up $850 billion, or 21% from fiscal 2021. President Joe Biden touted the deficit reductions in rema…