(Reuters) - Marks & Spencer's chief digital and technology officer is stepping down from her role, months after a cyberattack crippled its online operations, the British retailer said on Thursday. An M&S spokesperson said that Rachel Higham, who joined the group last June, was taking a career break. "Rachel has decided to take a break and is stepping back from her role, having been a valued part of the leadership team," the spokesperson said. "She has been a steady hand and calm head at an extraordinary ...