Bump flake8 from 3.8.4 to 3.9.2

[dependabot-preview[bot]]

Bumps flake8 from 3.8.4 to 3.9.2.

Commits

• c6e0d27 Release 3.9.2
• c428c55 Merge pull request #1328 from PyCQA/fix_indent_size_str
• f7bda92 Release 3.9.1
• e3313e0 Fix bug for plugins using extend_default_ignore
• 434c108 Release 3.9.0
• 7c96c1e Merge branch 'pycodestyle_2_7_0' into 'master'
• 40aba49 upgrade pycodestyle to 2.7.0
• ac9c66e Add indent-size option
• fd71b86 Merge branch 'pyflakes_3_3' into 'master'
• 1eccf9a upgrade pyflakes to 2.3.x
• Additional commits viewable in compare view

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