Do not use sphinx 4.0
Do not use sphinx 4.0

Change-Id: I71596ac7216fae04c58ca45295cf8b25b5446f38
Signed-off-by: Xqt <59bd0a3ff43b32849b319e645d4798d8a5d1e889@gno.de>
wikimedia/pywikibot-core,wikimedia/pywikibot-core