By David Shepardson WASHINGTON (Reuters) – General Motors Co said Monday it is ramping up its electric vehicle assembly plans, hiking production of the EV Chevrolet Bolt and other vehicles. GM reported its highest quarterly sales of the Chevrolet Bolt EV and Bolt EUV, which totaled 14,709 vehicles. Bolt sales are down 11% for the first nine months of the year versus the same period last year. In June, GM said it would sharply cut Bolt prices after it halted sales for six months following a battery recall. GM will boost Bolt production for global markets to more than 70,000 in 2023 from about 4…