Run flake8 with reviewdog

Version updated for reviewdog/action-flake8 to version v3.8.0.

• This publisher is shown as ‘verified’ by GitHub.
• This action is used across all versions by 317 repositories.

Go to the GitHub Marketplace to find the latest changes.

Release notes

v3.8.0: PR #51 - chore(deps): update reviewdog to 0.15.0

• reviewdog
• GitHub Actions