Bump flake8 from 3.9.1 to 3.9.2

[dependabot[bot]]

Bumps flake8 from 3.9.1 to 3.9.2.

Commits

• c6e0d27 Release 3.9.2
• c428c55 Merge pull request #1328 from PyCQA/fix_indent_size_str
• See full diff in compare view

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