chore(deps): bump express from 4.21.0 to 4.21.1

Bumps [express](https://github.com/expressjs/express) from 4.21.0 to 4.21.1.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/4.21.1/History.md)
- [Commits](expressjs/express@4.21.0...4.21.1)

---
updated-dependencies:
- dependency-name: express
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

package.json

@@ -15,7 +15,7 @@
   },
   "dependencies": {
     "@slack/bolt": "^3.22.0",
-    "express": "^4.21.0",
+    "express": "^4.21.1",
     "moment-timezone": "^0.5.46",
     "monk": "^7.3.1",
     "winston": "^3.15.0"