Make flake8 pass when run with Python 3.12

[AlexWaygood]

Description

If you run pre-commit run -a flake8 on Black with a Python 3.12 environment, it fails:

(.venv) C:\Users\alexw\coding\black>pre-commit run -a flake8
[INFO] Initializing environment for https://github.com/pre-commit/mirrors-mypy.
[INFO] Initializing environment for https://github.com/pre-commit/mirrors-mypy:types-PyYAML,tomli >= 0.2.6, < 2.0.0,click >= 8.1.0, != 8.1.4, != 8.1.5,packaging >= 22.0,platformdirs >= 2.1.0,pytest,hypothesis,aiohttp >= 3.7.4,types-commonmark,urllib3,hypothesmith.
flake8...................................................................Failed
- hook id: flake8
- exit code: 1

src/black/parsing.py:178:31: E226 missing whitespace around arithmetic operator
src/black/parsing.py:214:35: E226 missing whitespace around arithmetic operator

This is because flake8 is now able to detect errors inside f-strings on Python 3.12. It isn't able to do this on older versions of Python, but, due to changes in Python's tokenizer on Python 3.12, it can when run using Python 3.12.

Checklist - did you ...

• Add an entry in CHANGES.md if necessary?
• Add / update tests if necessary?
• Add new / update outdated documentation?

[JelleZijlstra]

hm, PyPy on Windows is failing consistently with

.tox\ci-pypy3\lib\site-packages\aiohttp\cookiejar.py:64: in CookieJar
    calendar.timegm(time.gmtime(MAX_TIME))
E   ValueError: Invalid argument

I assume it's a regression in the latest aiohttp, but I don't see it reported anywhere yet.

[JelleZijlstra]

Likely due to aio-libs/aiohttp#7824

[JelleZijlstra]

Reported aio-libs/aiohttp#7848

[AlexWaygood]

hm, PyPy on Windows is failing consistently

I opened #4051 to get CI green again :)

[github-actions]

diff-shades reports zero changes comparing this PR (1a978bd) to main (85b1c71).

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