PARIS—France on Wednesday eased several COVID-19 restrictions, with authorities saying it’s no longer always mandatory to wear masks outdoors and halting an 8-month nightly coronavirus curfew this weekend. The announcement by French Prime Minister Jean Castex comes as France is registering about 3,900 new virus cases a day, down from 35,000 a day in the March-April peak. Castex welcomed “very good news” and said the curfew will be lifted on Sunday, 10 days earlier than expected. Wearing a mask will still remain mandatory outdoors in crowded places like street markets and stadiums, he said. People are required to wear a mask indoors in public spaces, including at work—with an exception for restaurants and bars. “We have not known such a low level of virus spreading since last August,” Castex said, adding that the situation was improving in all of France’s regions. “Those positive evolutions are due to the mobilization of …