CEO departures dipped slightly nationwide in October compared to a year ago, including one Austin-area C-suite leader who made a move. Last month, 104 CEOs departed nationwide, down 2.8 percent from 107 in September and 3.7 from October of last year according to a report released Thursday by global outplacement consultancy Challenger, Gray & Christmas Inc. Challenger has now tracked 1,053 CEO changes so far this year, 5.3 percent more than the 999 departures announced in the first ten months…