By Atharva Singh, Arasu Kannagi Basil and Echo Wang (Reuters) - Cybersecurity firm Netskope commanded an $8.79 billion valuation as its shares jumped 21$23 apiece, well above the $19 offer price. Netskope raised$908.2 million in its IPO by selling 47.8 million shares at the top end of its bumped-up range of $17 to$19 apiece. The U.S. IPO market is enjo ...