CI: (deps): Bump flake8-requirements from 1.7.7 to 1.7.8 in /ci

Bumps [flake8-requirements](https://github.com/Arkq/flake8-requirements) from 1.7.7 to 1.7.8.
- [Commits](arkq/flake8-requirements@v1.7.7...v1.7.8)

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

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

ci/linting_requirements.txt

@@ -8,7 +8,7 @@ flake8-continuation==1.0.5
 flake8-copyright==0.2.4
 flake8-isort==6.0.0
 isort==5.12.0
-flake8-requirements==1.7.7
+flake8-requirements==1.7.8
 
 flake8-rst-docstrings==0.3.0