Use utf8mb4 for stage MySQL connections
Use utf8mb4 for stage MySQL connections

The -stage database was just migrated to utf8mb4, so this can be enabled.

eviljeff/olympia,kumar303/addons-server,mozilla/addons-server,mozilla/olympia,kumar303/addons-server,mozilla/addons-server,kumar303/olympia,diox/olympia,wagnerand/olympia,mozilla/olympia,wagnerand/olympia,kumar303/olympia,mozilla/olympia,kumar303/olympia,kumar303/addons-server,bqbn/addons-server,wagnerand/addons-server,diox/olympia,diox/olympia,bqbn/addons-server,wagnerand/addons-server,psiinon/addons-server,wagnerand/olympia,mozilla/addons-server,kumar303/olympia,kumar303/addons-server,wagnerand/addons-server,wagnerand/addons-server,bqbn/addons-server,wagnerand/olympia,bqbn/addons-server,diox/olympia,psiinon/addons-server,eviljeff/olympia,psiinon/addons-server,eviljeff/olympia,psiinon/addons-server,mozilla/olympia,mozilla/addons-server,eviljeff/olympia