Bump flake8 from 4.0.1 to 5.0.2 (#122)

Bumps [flake8](https://github.com/pycqa/flake8) from 4.0.1 to 5.0.2.
- [Release notes](https://github.com/pycqa/flake8/releases)
- [Commits](https://github.com/pycqa/flake8/compare/4.0.1...5.0.2)

---
updated-dependencies:
- dependency-name: flake8
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

requirements-dev.txt

@@ -1,7 +1,7 @@
 attribution==1.5.2
 black==22.3.0
 coverage[toml]==6.2
-flake8==4.0.1
+flake8==5.0.2
 flit==3.7.1
 mypy==0.971
 sphinx==4.3.2