[barbican][keystone] Weekly meetings to resume in 2022

Hi Barbican and Keystone contributors! I'll be taking some time off for the holidays starting next week and won't be available to chair the weekly meetings. I'll be back on January 11 to resume the weekly meetings for both Barbican and Keystone teams. Happy holidays, y'all! See you in 2022! - Douglas Mendizábal (redrobot)