[tacker][ptg] Announcement about operator hours

Hello all: The "operator-hour-tacker" has been reserved on 19-Oct Wednesday from 04UTC to 05UTC. This is the oppotunity to share operator's opinion with developers. Please feel free for adding any topics you'd like to discuss on the etherpad [1]. [1]https://etherpad.opendev.org/p/oct2022-ptg-operator-hour-tacker Thanks, Masaki