By Jonathan Stempel NEW YORK (Reuters) -A federal appeals court on Thursday ordered the dismissal of a National Rifle Association lawsuit accusing a New York regulator of stifling its speech by pressuring banks and insurers to stop doing business with the gun rights group. In a 3-0 decision, the 2nd U.S. Circuit Court of Appeals in Manhattan said the NRA failed to prove that Maria Vullo, the former superintendent of New York’s Department of Financial Services (DFS), “crossed the line between attempts to convince and attempts to coerce.” Vullo had in April 2018 called upon banks and insurers to…