chore(deps): update dependency flake8 to v6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
flake8 (changelog)	^5.0 -> ^6.0

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Release Notes

pycqa/flake8

### [`v6.0.0`](https://togithub.com/pycqa/flake8/compare/5.0.4...6.0.0) [Compare Source](https://togithub.com/pycqa/flake8/compare/5.0.4...6.0.0) ### [`v5.0.4`](https://togithub.com/pycqa/flake8/compare/5.0.3...5.0.4) [Compare Source](https://togithub.com/pycqa/flake8/compare/5.0.3...5.0.4) ### [`v5.0.3`](https://togithub.com/pycqa/flake8/compare/5.0.2...5.0.3) [Compare Source](https://togithub.com/pycqa/flake8/compare/5.0.2...5.0.3) ### [`v5.0.2`](https://togithub.com/pycqa/flake8/compare/5.0.1...5.0.2) [Compare Source](https://togithub.com/pycqa/flake8/compare/5.0.1...5.0.2) ### [`v5.0.1`](https://togithub.com/pycqa/flake8/compare/5.0.0...5.0.1) [Compare Source](https://togithub.com/pycqa/flake8/compare/5.0.0...5.0.1)

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