Bump flake8 from 4.0.1 to 5.0.4 (#729)

* Bump flake8 from 4.0.1 to 5.0.4

Bumps [flake8](https://github.com/pycqa/flake8) from 4.0.1 to 5.0.4.
- [Release notes](https://github.com/pycqa/flake8/releases)
- [Commits](PyCQA/flake8@4.0.1...5.0.4)

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

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

* Update requirements-dev.txt

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

Author: dependabot[bot]

requirements-dev.txt

@@ -6,8 +6,8 @@ attrs==22.1.0
 chardet==5.0.0
 cryptography==38.0.1
 docker==6.0.0
-flake8==4.0.1
-flake8-bandit==3.0.0
+flake8==5.0.4
+flake8-bandit==4.1.1
 flake8-bugbear==22.9.23
 flake8-import-order==0.18.1
 flake8-requirements==1.7.2