chore(deps): update dependency flake8 to v3.9.2

This MR contains the following updates:

Package	Update	Change
flake8 (changelog)	minor	==3.7.7 -> ==3.9.2

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Release Notes

pycqa/flake8

v3.9.2

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v3.9.1

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v3.9.0

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v3.8.4

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v3.8.3

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v3.8.2

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v3.8.1

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v3.8.0

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v3.7.9

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v3.7.8

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Configuration

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