build(deps): bump flake8 from 3.9.2 to 5.0.4

Bumps [flake8](https://github.com/pycqa/flake8) from 3.9.2 to 5.0.4.
- [Release notes](https://github.com/pycqa/flake8/releases)
- [Commits](PyCQA/flake8@3.9.2...5.0.4)

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

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

linter-requirements.txt

@@ -1,5 +1,5 @@
 black==22.3.0
-flake8==3.9.2
+flake8==5.0.4
 flake8-import-order==0.18.1
 mypy==0.961
 types-certifi