@slack/bolt@3.21.4

What's Changed

• chore(deps): upgrade path-to-regexp to partially address a security vulnerability (#2242) by @filmaj in https://github.com/slackapi/bolt-js/pull/2251

Full Changelog: https://github.com/slackapi/bolt-js/compare/@slack/bolt@3.21.3...@slack/bolt@3.21.4