CI: (deps): Bump the flake8 group in /ci with 1 update

Bumps the flake8 group in /ci with 1 update: [flake8-requirements](https://github.com/Arkq/flake8-requirements).

- [Commits](arkq/flake8-requirements@v1.7.8...v2.0.1)

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

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

ci/linting_requirements.txt

@@ -8,7 +8,7 @@ flake8-continuation==1.0.5
 flake8-copyright==0.2.4
 flake8-isort==6.1.1
 isort==5.12.0
-flake8-requirements==1.7.8
+flake8-requirements==2.0.1
 
 flake8-rst-docstrings==0.3.0