Upgrade black to fix conflict with Click 8.1

[sr-verde]

Running tox fails due to a known conflict between black versions < 22.3 and Click 8.1.

tox -r -e format
.package recreate: /home/theus/git/other/flask-mailman/.tox/.package
.package installdeps: poetry-core>=1.0.0
format recreate: /home/theus/git/other/flask-mailman/.tox/format
format inst: /home/theus/git/other/flask-mailman/.tox/.tmp/package/1/flask_mailman-0.3.0.tar.gz
format installed: attrs==22.2.0,black==21.12b0,click==8.1.3,coverage==7.1.0,flake8==3.9.2,Flask==2.2.3,flask-mailman @ file:///home/theus/git/other/flask-mailman/.tox/.tmp/package/1/flask_mailman-0.3.0.tar.gz,iniconfig==2.0.0,isort==5.12.0,itsdangerous==2.1.2,Jinja2==3.1.2,MarkupSafe==2.1.2,mccabe==0.6.1,mkdocs-material-extensions==1.1.1,mypy-extensions==1.0.0,packaging==23.0,pathspec==0.11.0,platformdirs==3.0.0,pluggy==1.0.0,py==1.11.0,pycodestyle==2.7.0,pyflakes==2.3.1,pytest==6.2.5,pytest-cov==2.12.1,toml==0.10.2,tomli==1.2.3,typing_extensions==4.5.0,Werkzeug==2.2.3
format run-test-pre: PYTHONHASHSEED='560391681'
format run-test: commands[0] | isort flask_mailman
format run-test: commands[1] | black flask_mailman tests
Traceback (most recent call last):
  File "/home/theus/git/other/flask-mailman/.tox/format/bin/black", line 8, in <module>
    sys.exit(patched_main())
  File "/home/theus/git/other/flask-mailman/.tox/format/lib/python3.10/site-packages/black/__init__.py", line 1372, in patched_main
    patch_click()
  File "/home/theus/git/other/flask-mailman/.tox/format/lib/python3.10/site-packages/black/__init__.py", line 1358, in patch_click
    from click import _unicodefun
ImportError: cannot import name '_unicodefun' from 'click' (/home/theus/git/other/flask-mailman/.tox/format/lib/python3.10/site-packages/click/__init__.py)
ERROR: InvocationError for command /home/theus/git/other/flask-mailman/.tox/format/bin/black flask_mailman tests (exited with code 1)
________________________________________________ summary _________________________________________________
ERROR:   format: commands failed

This merge request fixes that by upgrading black to > 22.3.

[codecov]

Codecov Report

Base: 63.10% // Head: 63.10% // No change to project coverage 👍

Coverage data is based on head (2e4a62c) compared to base (5369264).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #44   +/-   ##
=======================================
  Coverage   63.10%   63.10%           
=======================================
  Files           9        9           
  Lines         580      580           
=======================================
  Hits          366      366           
  Misses        214      214           

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[greyli]

Thanks!