Bump @slack/bolt from 3.15.0 to 3.16.0

Bumps [@slack/bolt](https://github.com/slackapi/bolt) from 3.15.0 to 3.16.0.
- [Release notes](https://github.com/slackapi/bolt/releases)
- [Commits](https://github.com/slackapi/bolt/compare/@slack/bolt@3.15.0...@slack/bolt@3.16.0)

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

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

package.json

@@ -4,7 +4,7 @@
     "description": "Slack Interface between our API and the official Slack API",
     "main": "src/index.js",
     "dependencies": {
-        "@slack/bolt": "^3.15.0",
+        "@slack/bolt": "^3.16.0",
         "body-parser": "^1.20.2",
         "dotenv": "^16.3.1",
         "https-proxy-agent": "^7.0.2",