Infra: update linting/formatting for non-`peps/` dirs - #5121

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hugovk wants to merge 5 commits into

python:mainfrom

hugovk:ruff-check-release_management

Commits on Sep 9, 2026

ruff-check release_management
hugovk
committed
601c507
Use single formatter
hugovk
committed
1dbc092
Add pyupgrade and flake8-2020 rules
hugovk
committed
2de5603
Format and lint all dirs except peps/
hugovk
committed
247f033
Add check-readthedocs
hugovk
committed
ab50db5