Bump pyflakes from 2.3.1 to 2.4.0 (#1194)
Bump pyflakes from 2.3.1 to 2.4.0 (#1194)

Bumps [pyflakes](https://github.com/PyCQA/pyflakes) from 2.3.1 to 2.4.0.
- [Release notes](https://github.com/PyCQA/pyflakes/releases)
- [Changelog](https://github.com/PyCQA/pyflakes/blob/master/NEWS.rst)
- [Commits](https://github.com/PyCQA/pyflakes/compare/2.3.1...2.4.0)

---
updated-dependencies:
- dependency-name: pyflakes
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
mozilla/relman-auto-nag,mozilla/relman-auto-nag,mozilla/relman-auto-nag