[manila][ptl] Non-candidacy for the Ussuri Cycle

I want to thank the Manila community for allowing me to serve as PTL for the last three cycles, but it is time for us to change it up! I know it's late for this announcement, but I wanted first to make sure that I won't be leaving an unfilled vacancy and events conspired such that that took longer than anticipated :) So stay tuned for an announcment shortly of a nomination for a new PTL for Ussuri -- I'm sure you'll be as pleased as I am with what you'll read. I'm not going anywhere. I'll be working on Manila itself and helping the new PTL, as well as working with actual Manila deployments and the use of Manila as open infrastructure by adjacent communities. Thanks again! -- Tom Barron