Bump flake8 from 6.0.0 to 6.1.0 in /tests

[dependabot[bot]]

Bumps flake8 from 6.0.0 to 6.1.0.

Commits

• 7ef0350 Release 6.1.0
• 354f873 Merge pull request #1852 from PyCQA/setup-cfg-fmt
• 24be8ad Merge pull request #1851 from PyCQA/pylint-warnings
• 5233d88 use setup-cfg-fmt
• d4d1552 Merge pull request #1849 from PyCQA/handle-multiline-fstrings-in-312
• cc301ed fix pylintrc warnings
• 1ed78d5 handle multiline fstrings in 3.12
• f264195 Merge pull request #1850 from PyCQA/312-test
• acca35b add 3.12 to ci matrix
• 579f9f6 Merge pull request #1848 from PyCQA/upgrade-pycodestyle
• Additional commits viewable in compare view

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[reviewpad[bot]]

AI-Generated Summary: This pull request contains an update to the version of the flake8 package used in the testing environment, from version 6.0.0 to 6.1.0. The change is made in the requirements-test.txt file. This is a minor semantic versioning update for the package.