PARIS—Franco-Italian chipmaker STMicroelectronics said its preliminary fourth-quarter revenues were slightly above the guidance given at the end of October, in the context of a global microchip supply crunch, which gave a lift to its shares. Sales for the last three months of 2021 increased by 11.2 percent sequentially, coming in at $3.56 billion which was above a company forecast of $3.40 billion. Full year sales jumped by 24.9 percent to $12.76 billion, also higher than STMicro’s October 2021 forecast. STMicro’s update outlook echoed that of its peer Samsung Electronics, which on Friday said its fourth-quarter operating profit likely jumped 52 percent on-year to its highest for the quarter in four years, helped by solid demand for server memory chips and higher margins in chip contract manufacturing. “We ended the fourth quarter of 2021 with net revenues above the outlook range and gross margin at, or slightly above, the high-end of …