CI failing due to Sphinx/Jinja mismatch

[jayvdb]

Package version (if known): master

Describe the bug

Sphinx 3 is being installed, which is incompatible with Jinja 3.

Steps to Reproduce

1. Go to https://github.com/inveniosoftware/dictdiffer/runs/7955284018

Expected behavior

Screenshots (if applicable)

Run ./run-tests.sh
  ./run-tests.sh
lists of files in version control and sdist match
Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.9.13/x64/lib/python3.9/runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/opt/hostedtoolcache/Python/3.9.13/x64/lib/python3.9/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/opt/hostedtoolcache/Python/3.9.13/x64/lib/python3.9/site-packages/sphinx/cmd/build.py", line 25, in <module>
    from sphinx.application import Sphinx
  File "/opt/hostedtoolcache/Python/3.9.13/x64/lib/python3.9/site-packages/sphinx/application.py", line 42, in <module>
    from sphinx.registry import SphinxComponentRegistry
  File "/opt/hostedtoolcache/Python/3.9.13/x64/lib/python3.9/site-packages/sphinx/registry.py", line 24, in <module>
    from sphinx.builders import Builder
  File "/opt/hostedtoolcache/Python/3.9.13/x64/lib/python3.9/site-packages/sphinx/builders/__init__.py", line 26, in <module>
    from sphinx.util import import_object, logging, rst, progress_message, status_iterator
  File "/opt/hostedtoolcache/Python/3.9.13/x64/lib/python3.9/site-packages/sphinx/util/rst.py", line 22, in <module>
    from jinja2 import environmentfilter
ImportError: cannot import name 'environmentfilter' from 'jinja2' (/opt/hostedtoolcache/Python/3.9.13/x64/lib/python3.9/site-packages/jinja2/__init__.py)

Additional context