Update dependency sphinx to v4

1 job for !158 with renovate/sphinx-4.x in 8 minutes and 25 seconds (queued for 4 seconds)
latest merge request
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pages Deploy
  File "/usr/local/lib/python3.9/site-packages/sphinx/builders/__init__.py", line 26, in <module>
from sphinx.util import import_object, logging, progress_message, rst, status_iterator
File "/usr/local/lib/python3.9/site-packages/sphinx/util/rst.py", line 21, in <module>
from jinja2 import Environment, environmentfilter
ImportError: cannot import name 'environmentfilter' from 'jinja2' (/usr/local/lib/python3.9/site-packages/jinja2/__init__.py)
make: *** [Makefile:19: html] Error 1
make: Leaving directory '/builds/AlekSIS/official/AlekSIS/docs'
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1