Bump slack-sdk from 3.40.0 to 3.40.1 in /demos (#1751)

Bumps [slack-sdk](https://github.com/slackapi/python-slack-sdk) from 3.40.0 to 3.40.1.
- [Release notes](https://github.com/slackapi/python-slack-sdk/releases)
- [Commits](slackapi/python-slack-sdk@v3.40.0...v3.40.1)

---
updated-dependencies:
- dependency-name: slack-sdk
  dependency-version: 3.40.1
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

demos/moderator_bot/requirements-dev.txt

@@ -18,7 +18,7 @@ pyyaml==6.0.3
 scikit-learn==1.8.0
 scipy==1.17.0
 six==1.17.0
-slack_sdk==3.40.0
+slack_sdk==3.40.1
 urllib3==2.6.3
 yarl==1.22.0
 zipp==3.23.0