Bump flake8 from 6.0.0 to 6.1.0 in /requirements (#1221)

Bumps [flake8](https://github.com/pycqa/flake8) from 6.0.0 to 6.1.0.
- [Commits](PyCQA/flake8@6.0.0...6.1.0)

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

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

Author: dependabot[bot]

requirements/lint.txt

@@ -1,3 +1,3 @@
 black==23.7.0
-flake8==6.0.0
+flake8==6.1.0
 isort==5.12.0