chore(deps): update @slack/types requirement from ^2.19.0 to ^2.20.0

Updates the requirements on [@slack/types](https://github.com/slackapi/node-slack-sdk) to permit the latest version.
- [Release notes](https://github.com/slackapi/node-slack-sdk/releases)
- [Commits](https://github.com/slackapi/node-slack-sdk/compare/@slack/types@2.19.0...@slack/types@2.20.0)

---
updated-dependencies:
- dependency-name: "@slack/types"
  dependency-version: 2.20.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package.json

@@ -45,7 +45,7 @@
     "@slack/logger": "^4.0.0",
     "@slack/oauth": "^3.0.4",
     "@slack/socket-mode": "^2.0.5",
-    "@slack/types": "^2.19.0",
+    "@slack/types": "^2.20.0",
     "@slack/web-api": "^7.13.0",
     "axios": "^1.12.0",
     "express": "^5.0.0",