[pre-commit.ci] pre-commit autoupdate

[pre-commit-ci[bot]]

updates:

• github.com/PyCQA/flake8: 3.9.2 → 4.0.1

[peterjc]

Interesting difference, but why (the syntax error is deliberate)?:

flake8...................................................................Failed
- hook id: flake8
- exit code: 1

tests/test_cases/no_closing_bracket.py:30:19: E999 SyntaxError: unexpected EOF while parsing

[peterjc]

There were several changes to flake8's syntax error handling in this version bump, seems must now exclude our deliberate syntax error test case as per 420c3ce3a19bd1e311cb9bccf08e40071b0f7649