Update dependency flake8 to v7

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
flake8 (changelog)	^6.0.0 -> ^7.0.0

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Release Notes

pycqa/flake8 (flake8)

### [`v7.0.0`](https://togithub.com/pycqa/flake8/compare/6.1.0...7.0.0) [Compare Source](https://togithub.com/pycqa/flake8/compare/6.1.0...7.0.0)

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Configuration

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♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• [ ] If you want to rebase/retry this PR, check this box

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (612d5bd) 65.24% compared to head (02d5824) 65.52%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #459 +/- ## ========================================== + Coverage 65.24% 65.52% +0.27% ========================================== Files 10 10 Lines 1456 1456 Branches 301 301 ========================================== + Hits 950 954 +4 + Misses 452 448 -4 Partials 54 54 ```

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