build(deps): bump @slack/bolt in /ai/slackbot-mcp-client/slack-identity

Bumps [@slack/bolt](https://github.com/slackapi/bolt-js) from 4.7.3 to 5.0.0.
- [Release notes](https://github.com/slackapi/bolt-js/releases)
- [Changelog](https://github.com/slackapi/bolt-js/blob/main/CHANGELOG.md)
- [Commits](slackapi/bolt-js@v4.7.3...v5.0.0)

---
updated-dependencies:
- dependency-name: "@slack/bolt"
  dependency-version: 5.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]