Black specifies a requirement for click>=7.1.2 but actually requires click>=8.0

Describe the bug

Installing black from the head of the main branch and click<8.0 results in a stack trace whenever the tool is run.

To Reproduce

python3 -m venv black-click-compat-bug
source black-click-compat-bug/bin/activate
python -m pip install \
  "click<8.0" \
  git+https://github.com/psf/black
black --help

Resulting traceback:

Traceback (most recent call last):
  File "/home/enpaul/black-click-compat-bug/bin/black", line 5, in <module>
    from black import patched_main
  File "/home/enpaul/black-click-compat-bug/lib64/python3.10/site-packages/black/__init__.py", line 34, in <module>
    from click.core import ParameterSource
ImportError: cannot import name 'ParameterSource' from 'click.core' (/home/enpaul/black-click-compat-bug/lib64/python3.10/site-packages/click/core.py)

Expected behavior

Black should specify a requirement for click>=8.0.0 (actual specification is for >=7.1.2)

Environment

• Black’s version: 21.12b1.dev40+g565f9c9
• OS: Linux (Fedora 35)
• Python: Python 3.10.1

[Duciwuci]

This didn’t fix the problem.

I still got the problem with:

python: 3.7 black: 22.1.0 click: 8.0.4

File "/usr/local/bin/black", line 5, in <module>
   from black import patched_main
File "src/black/__init__.py", line 35, in <module>
ImportError: cannot import name 'ParameterSource' from 'click.core' (/usr/local/lib/python3.7/site-packages/click/core.py)

[mdgilene]

Forcing click>=8.0.0 on users for a dev dependency is pretty harsh. There are MANY application dependencies that are still locked to <=7.1.2.

Due to this I can’t upgrade from the latest Black beta release.