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

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

- [Changelog](https://github.com/gforcada/flake8-isort/blob/master/CHANGES.rst)
- [Commits](gforcada/flake8-isort@6.0.0...6.1.0)

---
updated-dependencies:
- dependency-name: flake8-isort
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: flake8
...

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

ci/linting_requirements.txt

@@ -6,7 +6,7 @@ pyflakes==3.1.0
 
 flake8-continuation==1.0.5
 flake8-copyright==0.2.4
-flake8-isort==6.0.0
+flake8-isort==6.1.0
 isort==5.12.0
 flake8-requirements==1.7.8