Bump pytest-flakes from 4.0.3 to 4.0.4 (#390)

Bumps [pytest-flakes](https://github.com/asmeurer/pytest-flakes) from 4.0.3 to 4.0.4.
- [Release notes](https://github.com/asmeurer/pytest-flakes/releases)
- [Commits](asmeurer/pytest-flakes@4.0.3...4.0.4)

---
updated-dependencies:
- dependency-name: pytest-flakes
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements-dev.txt

@@ -4,7 +4,7 @@ pytest==6.1.2
 pytest-aiohttp==0.3.0
 pytest-cov==3.0.0
 pytest-runner==5.2
-pytest-flakes==4.0.3
+pytest-flakes==4.0.4
 pytest-pylint==0.18.0
 pytest-sugar==0.9.4
 flake8==3.8.4