Paramount Skydance Corp. raised its offer to buy Warner Bros. Discovery Inc., extending the long-running battle for one of Hollywood’s iconic studios, according to people familiar with the matter.The new, unspecified bid improves on the $30-a-share, all-cash proposal that Paramount took directly to Warner Bros. shareholders on Dec. 8 and addresses some of the company’s concerns with previous Paramount bids, according to the people, who asked to not be identified because the details aren’t public. Those conc ...