Bump Sphinx to 4.0.3 (#17912)
Bump Sphinx to 4.0.3 (#17912)

* Bump Sphinx to 4.0.3

* Our jinja env needs markupsafe...
mozilla/addons-server,wagnerand/addons-server,mozilla/addons-server,diox/olympia,mozilla/olympia,mozilla/olympia,wagnerand/addons-server,mozilla/olympia,wagnerand/addons-server,mozilla/addons-server,diox/olympia,diox/olympia,diox/olympia,wagnerand/addons-server,mozilla/olympia,mozilla/addons-server