Fixed deprecated warning issue due to FixedOffset (#13988)
Fixed deprecated warning issue due to FixedOffset (#13988)

Removed FixedOffset usage and replaced with datetime.timezone
diox/olympia,bqbn/addons-server,mozilla/addons-server,wagnerand/addons-server,diox/olympia,eviljeff/olympia,eviljeff/olympia,wagnerand/addons-server,wagnerand/addons-server,bqbn/addons-server,mozilla/addons-server,wagnerand/addons-server,mozilla/addons-server,diox/olympia,bqbn/addons-server,eviljeff/olympia,bqbn/addons-server,mozilla/olympia,mozilla/olympia,mozilla/olympia,mozilla/olympia,mozilla/addons-server,diox/olympia,eviljeff/olympia