Update dependency flake8-isort to v6

This MR contains the following updates:

Package	Type	Update	Change
flake8-isort	dev-dependencies	major	^4.0.0 -> ^6.0.0

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Release Notes

gforcada/flake8-isort

v6.0.0

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• Drop isort 4.x support. [gforcada]

• Add support for flake8 6.0.0. [gforcada]

• Add --isort-no-skip-gitignore option to allow temporarily overriding the set value of isort's skip_gitignore option with False. This can cause flake8-isort to run significantly faster at the cost of making flake8-isort's behavior differ slightly from the behavior of isort --check. [gschaffner]

v5.0.3

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• Fix broken add_options method, again. [casperdcl]

v5.0.2

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• Fix broken add_options method [casperdcl]

v5.0.1

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• Improve the config option is added and read back. [gforcada]

• Bump plugin version. [gforcada]

v5.0.0

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• Update dependencies. [gforcada]

• Revamp GitHub actions. [gforcada]

• Drop python 3.6, and add python 3.10. [gforcada]

• Use linters and formatters to keep code sane and beautiful. [gforcada]

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