Update dependency flake8 to v6 - autoclosed

This MR contains the following updates:

Package	Type	Update	Change
flake8 (changelog)	dev-dependencies	major	^3.8.2 -> ^6.0.0

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Release Notes

pycqa/flake8

v6.1.0

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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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v4.0.1

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v4.0.0

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Configuration

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

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This MR has been generated by Renovate Bot.

pyproject.toml

@@ -49,7 +49,7 @@ pytest-cov = "^2.9.0"
 pytest-sugar = "^0.9.3"
 black = "^19.10b0"
 isort = "^5.0.0"
-flake8 = "^3.8.2"
+flake8 = "^6.0.0"
 flake8-black = "^0.2.0"
 flake8-mypy = "^17.8.0"
 flake8-bandit = "^2.1.2"