Bump slack-sdk from 3.27.2 to 3.28.0 (#369)

Bumps [slack-sdk](https://github.com/slackapi/python-slack-sdk) from 3.27.2 to 3.28.0.
- [Release notes](https://github.com/slackapi/python-slack-sdk/releases)
- [Changelog](https://github.com/slackapi/python-slack-sdk/blob/main/docs-v2/changelog.html)
- [Commits](slackapi/python-slack-sdk@v3.27.2...v3.28.0)

---
updated-dependencies:
- dependency-name: slack-sdk
  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>

requirements/requirements_ingester.txt

@@ -26,7 +26,7 @@ pyopenssl==24.1.0
 pytz==2024.1
 PyYAML==6.0.1
 requests==2.32.3
-slack_sdk==3.27.2
+slack_sdk==3.28.0
 supervisor==4.2.5
 tables==3.9.2
 tensorflow==2.13.0