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

This MR contains the following updates:

Package	Change	Age	Confidence
flake8 (changelog)	==3.7.7 -> ==3.9.2

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Release Notes

pycqa/flake8 (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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dev-env-requirements.txt

@@ -4,6 +4,6 @@ graphene-django==3.0.0b7
 pytest==4.6.3
 pytest-django==3.5.0
 pytest-cov==2.7.1
-flake8==3.7.7
+flake8==3.9.2
 mock==2.0.0
 black==21.6b0