WASHINGTON — U.S. job openings rose unexpectedly in November, showing companies are still looking for workers even as the labor market has cooled overall. Openings rose to 8.1 million in November, the most since February and up from 7.8 million in October, the Labor Department reported Tuesday. They were down from 8.9 million a year earlier and a peak of 12.2 million in March 2022 as the economy was roaring back from COVID-19 lockdowns.