chore(deps): bump @slack/bolt from 3.19.0 to 4.2.0

Bumps [@slack/bolt](https://github.com/slackapi/bolt-js) from 3.19.0 to 4.2.0.
- [Release notes](https://github.com/slackapi/bolt-js/releases)
- [Commits](https://github.com/slackapi/bolt-js/compare/@slack/bolt@3.19.0...@slack/bolt@4.2.0)

---
updated-dependencies:
- dependency-name: "@slack/bolt"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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