ImportError: cannot import name '_unicodefun' from 'click'

[ChiliJohnson]

What happened:
A recent version of click has been released which removes _unicodefun, breaking the distributed CLI.

What you expected to happen:
The distributed CLI should work; the requirements should include a cap on the click version at 8.0.2.

Minimal Complete Verifiable Example:

$ pip install distributed
…
Successfully installed MarkupSafe-2.1.1 click-8.1.0 cloudpickle-2.0.0 dask-2022.3.0 distributed-2022.3.0 fsspec-2022.2.0 heapdict-1.0.1 jinja2-3.1.1 locket-0.2.1 msgpack-1.0.3 packaging-21.3 partd-1.2.0 psutil-5.9.0 pyparsing-3.0.7 pyyaml-6.0 sortedcontainers-2.4.0 tblib-1.7.0 toolz-0.11.2 tornado-6.1 zict-2.1.0

$ dask-scheduler 
Traceback (most recent call last):
  File "/usr/local/bin/dask-scheduler", line 8, in <module>
    sys.exit(go())
  File "/usr/local/lib/python3.9/site-packages/distributed/cli/dask_scheduler.py", line 216, in go
    check_python_3()
  File "/usr/local/lib/python3.9/site-packages/distributed/cli/utils.py", line 38, in check_python_3
    from click import _unicodefun
ImportError: cannot import name '_unicodefun' from 'click' (/usr/local/lib/python3.9/site-packages/click/__init__.py)

$ pip install --upgrade click==8.0.2
…
Successfully installed click-8.0.2

$ dask-scheduler 
2022-03-28 23:57:03,412 - distributed.scheduler - INFO - -----------------------------------------------
…

Environment:

• Dask version: 2022.3.0
• Python version: 3.9.7
• Operating System: Ubuntu
• Install method (conda, pip, source): pip