build(deps): update flake8 requirement from <7,>=5.0.4 to >=5.0.4,<8#20

WilliamBergamin merged 3 commits intomainslackapi/python-slack-hooks:mainfrom

dependabot/pip/flake8-gte-5.0.4-and-lt-8slackapi/python-slack-hooks:dependabot/pip/flake8-gte-5.0.4-and-lt-8Copy head branch name to clipboard