fix black~=22.1.0 incompatibility

[yoursvivek]

Intention was to fix #264, but I now see that there's another PR and what I thought was a one line fix, it it's. Will update this PR later as the other PR is also failing. For now this is WIP.

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.30%.

Quality metrics	Before	After	Change
Complexity	1.19 ⭐	1.22 ⭐	0.03 👎
Method Length	26.00 ⭐	26.38 ⭐	0.38 👎
Working memory	4.42 ⭐	4.45 ⭐	0.03 👎
Quality	91.55% ⭐	91.25% ⭐	-0.30% 👎

Other metrics	Before	After	Change
Lines	112	113	1

Changed files	Quality Before	Quality After	Quality Change
src/darker/config.py	91.55% ⭐	91.25% ⭐	-0.30% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation

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