Bump flake8 from 7.1.0 to 7.1.1

Bumps [flake8](https://github.com/pycqa/flake8) from 7.1.0 to 7.1.1.
- [Commits](PyCQA/flake8@7.1.0...7.1.1)

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

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

requirements.txt

@@ -1,6 +1,6 @@
 slack-bolt==1.19.0rc1
 pytest
-flake8==7.1.0
+flake8==7.1.1
 black==24.8.0
 slack-cli-hooks==0.0.2
 openai==1.37.1