fix support for black 22.1

[jabesq]

No description provided.

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.60%.

Quality metrics	Before	After	Change
Complexity	1.49 ⭐	1.51 ⭐	0.02 👎
Method Length	27.78 ⭐	28.17 ⭐	0.39 👎
Working memory	4.60 ⭐	4.77 ⭐	0.17 👎
Quality	89.49% ⭐	88.89% ⭐	-0.60% 👎

Other metrics	Before	After	Change
Lines	178	179	1

Changed files	Quality Before	Quality After	Quality Change
src/darker/config.py	91.55% ⭐	91.25% ⭐	-0.30% 👎
src/darker/import_sorting.py	84.42% ⭐	83.00% ⭐	-1.42% 👎

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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[Mystic-Mirage]

Let's use find_pyproject_toml instead:

    path = find_pyproject_toml(tuple(srcs or ["."]))
    if path is not None:

[akaihola]

What if someone uses Darker with a Python code base which doesn't have pyproject.toml?

[akaihola]

As noted elsewhere, in #270 I took the approach of supporting both the old and the new Black behavior.

[akaihola]

#270 has been merged instead. Thank you @jabesq for your contribution nevertheless!