AI data-security startup Cyberhaven Inc. said it had raised $88 million in a funding round that values the company at $488 million, showing that companies benefitting from the AI boom can still pull in cash at big mark-ups to previous rounds.The financing comes at a time when many startups are struggling to raise cash. Last quarter, venture capitalists spent just $36.56 billion to fund 2,882 deals, about half as much cash as two years earlier, and completed about one quarter fewer transactions, ...