build(deps): bump express from 4.20.0 to 4.21.0 (#555)

Bumps [express](https://github.com/expressjs/express) from 4.20.0 to 4.21.0.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/4.21.0/History.md)
- [Commits](expressjs/express@4.20.0...4.21.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -24,7 +24,7 @@
     "debug": "^4.3.7",
     "dotenv": "^16.4.5",
     "events-async": "^1.2.1",
-    "express": "^4.20.0",
+    "express": "^4.21.0",
     "glob": "11.0.0"
   },
   "devDependencies": {