SEATTLE — Boeing factory workers voted to reject a contract offer and continue a more than five-week strike on Wednesday, in a blow to new CEO Kelly Ortberg’s plan to shore up the finances of the struggling planemaker. The vote was 64% in opposition to the deal, which offered a 35% rise in wages over four years, in a major setback for Ortberg who took the top job in August on a pledge to work more closely with factory workers than his predecessors. The rejection of Boeing’s offer, which comes after 95% of workers voted against a first contract last