Update dependency flake8 to v6 - autoclosed

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
flake8 (changelog)	^4.0.1 -> ^6.0.0

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Release Notes

pycqa/flake8 (flake8)

v6.0.0

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v5.0.4

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v5.0.3

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v5.0.2

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v5.0.1

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v5.0.0

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

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

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

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• If you want to rebase/retry this MR, check this box

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