Update flake8 requirement from ~=4.0.1 to ~=6.1.0

[dependabot[bot]]

Updates the requirements on flake8 to permit the latest version.

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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[Patarimi]

I think that this fails because the python version used (3.6) is not supported by flake8 (docs). Since python 3.6 et 3.7 reach "end of life" (versions status), rising the minimal requirement to python 3.8 could be a good fix. What do you think ?

[donn]

@Patarimi I would honestly love to but that would also require us to change that requirement for OpenLane as well, which is a whole other beast. We're already requiring 3.8 for OpenLane 2.