Bump flake8 from 3.9.2 to 4.0.1 in /requirements

Created by: dependabot[bot]

Bumps flake8 from 3.9.2 to 4.0.1.

Commits

• 82b698e Release 4.0.1
• 0fac346 Merge pull request #1410 from PyCQA/parallel-syntax-error
• aa54693 fix parallel execution collecting a SyntaxError
• d31c535 Release 4.0.0
• afd2399 Merge pull request #1407 from asottile/setup-cfg-fmt
• 960cf8c rerun setup-cfg-fmt (and restore comments)
• d7baba5 Merge pull request #1406 from asottile/update-versions
• d79021a update dependency versions
• 283f0c8 Merge pull request #1404 from PyCQA/drop-xdg-config
• 807904a Drop support for Home and XDG config files
• Additional commits viewable in compare view

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