Update flake8 requirement from <4.1,>=3.9 to >=3.9,<5.1

[dependabot[bot]]

Updates the requirements on flake8 to permit the latest version.

Commits

• 405cfe0 Release 5.0.1
• d20bb97 Merge pull request #1631 from PyCQA/dupe-sys-path
• fce93b9 prevent duplicate plugin discovery on misconfigured pythons
• 3f4872a Merge pull request #1628 from mxr/patch-1
• b0cad55 Remove needless sort in _style_guide_for
• c7c6218 Release 5.0.0
• a826649 Merge pull request #1626 from PyCQA/pycodestyle-2-9
• 7838f11 upgrade pycodestyle to 2.9.x
• 66b3211 Merge pull request #1625 from PyCQA/upgrade-pyflakes
• b9e0c6e upgrade pyflakes to 2.5.x
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

Merging #163 (a86ba85) into master (bd2ec46) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #163   +/-   ##
=======================================
  Coverage   64.98%   64.98%           
=======================================
  Files          28       28           
  Lines        1411     1411           
=======================================
  Hits          917      917           
  Misses        494      494           

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[dependabot[bot]]

Superseded by #168.