Update dependency flake8 to v3.9.2 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
flake8 (changelog)	==3.8.3 -> ==3.9.2

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Configuration

📅 Schedule: "after 10pm every weekday,before 5am every weekday,every weekend" in timezone Pacific/Auckland.

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

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

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

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