Compatibility with flake8 v6.0.0

[ZLLentz]

Expected Behavior

flake8 should pass on the latest version

Current Behavior

flake8 fails on v6.0.0 with many errors shown.
It succeeds on v3.9.2, which is what pre-commit is running at

The newer version is either more strict or has more forbidden cases
There is also some version threshold where setup.cfg takes priority over .flake8 instead of the reverse, and the repo's current master has both. This part of the issue is handled in #1102

Possible Solution

Fix the style errors, for fun

Context

pre-commit autoupdate is currently a trap