Unpin doc/dev dependencies

[chrisjsewell]

@csadorf in 7b03f04 I had to pin sphinx and pylint-django to less than the latest versions:

For sphinx, on CircleCI we are getting: https://app.circleci.com/pipelines/github/aiidateam/aiida-core/2403/workflows/18751484-3474-49c1-849b-4bd307cd43b8/jobs/2395

reading sources... [ 60%] reference/apidoc/aiida.restapi

Exception occurred:
  File "/home/circleci/.local/lib/python3.7/site-packages/flask/globals.py", line 38, in _lookup_req_object
    raise RuntimeError(_request_ctx_err_msg)
RuntimeError: Working outside of request context.

This typically means that you attempted to use functionality that needed
an active HTTP request.  Consult the documentation on testing for
information about how to avoid this problem.
The full traceback has been saved in /tmp/sphinx-err-0am0v1k8.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!

Exited with code exit status 2

for pylint-django (see : https://github.com/aiidateam/aiida-core/runs/1657433968

pylint...................................................................Failed
- hook id: pylint
- exit code: 2

************* Module tests.manage.test_caching_config
tests/manage/test_caching_config.py:1:0: E5110: Django was not configured. For more information runpylint --load-plugins=pylint_django --help-msg=django-not-configured (django-not-configured)

------------------------------------
Your code has been rated at 10.00/10

************* Module aiida.workflows.arithmetic
aiida/workflows/arithmetic/__init__.py:1:0: E5110: Django was not configured. For more information runpylint --load-plugins=pylint_django --help-msg=django-not-configured (django-not-configured)

------------------------------------
Your code has been rated at 10.00/10

See https://github.com/PyCQA/pylint-django/blob/master/CHANGELOG.rst#version-240-06-jan-2021

these are not "production" dependencies, only for development/documentation, so I wouldn't say this is high priority

[csadorf]

Thank you for letting me know and creating the issue 👍 !

[chrisjsewell]

another one to add to the list: remove astroid from pre-commit extras (added in #4757) after pylint-dev/astroid#895 fixed

[chrisjsewell]

and some more from #4851 (pytets-cov, jupyter-client)