Bump slack-bolt from 1.18.0 to 1.18.1 (#4032)

Bumps [slack-bolt](https://github.com/slackapi/bolt-python) from 1.18.0 to 1.18.1.
- [Release notes](https://github.com/slackapi/bolt-python/releases)
- [Commits](slackapi/bolt-python@v1.18.0...v1.18.1)

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

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

requirements-base.txt

@@ -401,7 +401,7 @@ six==1.16.0
     #   python-dateutil
     #   sqlalchemy-filters
     #   validators
-slack-bolt==1.18.0
+slack-bolt==1.18.1
     # via -r requirements-base.in
 slack-sdk==3.26.0
     # via