Bump flake8 from 5.0.4 to 6.0.0

[dependabot[bot]]

Bumps flake8 from 5.0.4 to 6.0.0.

Commits

• b9a7794 Release 6.0.0
• b5cac87 Merge pull request #1748 from PyCQA/upgrade-pyflakes
• 489be4d upgrade pyflakes to 3.0.0
• 8c06197 Merge pull request #1746 from PyCQA/bump-pycodestyle
• 047e6f8 upgrade pycodestyle to 2.10
• 647996c Merge pull request #1744 from PyCQA/pre-commit-ci-update-config
• 646ad20 [pre-commit.ci] pre-commit autoupdate
• b87034d Merge pull request #1741 from PyCQA/drop-py37
• aa002ee require python 3.8.1+
• 16c371d Merge pull request #1739 from PyCQA/remove-optparse
• Additional commits viewable in compare view

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[Nothing4You]

@dependabot rebase

[Nothing4You]

flake8 6.0.0 requires python 3.8: https://flake8.pycqa.org/en/latest/release-notes/6.0.0.html#features

python 3.7 is not eol until 2023-06-27, so this is on hold until then.

[dependabot[bot]]

A newer version of flake8 exists, but since this PR has been edited by someone other than Dependabot I haven't updated it. You'll get a PR for the updated version as normal once this PR is merged.