Update dependency flake8 to v5

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
flake8 (changelog)	==4.0.1 -> ==5.0.4

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Release Notes

pycqa/flake8

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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