build(deps): bump slack-sdk from 3.37.0 to 3.39.0 (#34)

Bumps [slack-sdk](https://github.com/slackapi/python-slack-sdk) from 3.37.0 to 3.39.0.
- [Release notes](https://github.com/slackapi/python-slack-sdk/releases)
- [Commits](slackapi/python-slack-sdk@v3.37.0...v3.39.0)

---
updated-dependencies:
- dependency-name: slack-sdk
  dependency-version: 3.39.0
  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.txt

@@ -1,4 +1,4 @@
-slack-sdk==3.37.0
+slack-sdk==3.39.0
 slack-bolt==1.26.0
 
 # If you use a different LLM vendor, replace this dependency