chore(deps): bump express from 4.18.1 to 4.20.0 in /packages/slackbot

Bumps [express](https://github.com/expressjs/express) from 4.18.1 to 4.20.0.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@4.18.1...4.20.0)

---
updated-dependencies:
- dependency-name: express
  dependency-type: direct:production
...

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

packages/slackbot/package.json

@@ -27,7 +27,7 @@
     "@elastic/elasticsearch": "7.13.0",
     "@slack/bolt": "3.17.1",
     "dotenv-flow": "3.2.0",
-    "express": "4.18.1",
+    "express": "4.20.0",
     "module-alias": "2.2.3",
     "reflect-metadata": "0.1.13",
     "tmp-promise": "3.0.3"