build(deps): bump slack-bolt from 1.21.2 to 1.22.0

Bumps [slack-bolt](https://github.com/slackapi/bolt-python) from 1.21.2 to 1.22.0.
- [Release notes](https://github.com/slackapi/bolt-python/releases)
- [Commits](slackapi/bolt-python@v1.21.2...v1.22.0)

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

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

requirements.txt

@@ -1,3 +1,3 @@
-slack-bolt==1.21.2
+slack-bolt==1.22.0
 pytest==8.3.4
 ruff==0.8.4