build(deps-dev): bump express from 4.17.3 to 4.21.2

Bumps [express](https://github.com/expressjs/express) from 4.17.3 to 4.21.2.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/4.21.2/History.md)
- [Commits](expressjs/express@4.17.3...4.21.2)

---
updated-dependencies:
- dependency-name: express
  dependency-version: 4.21.2
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -24,7 +24,7 @@
     "cookie-parser": "1.4.6",
     "eslint": "8.56.0",
     "eslint-plugin-markdown": "3.0.1",
-    "express": "4.17.3",
+    "express": "4.21.2",
     "mocha": "10.8.2",
     "nyc": "15.1.0",
     "supertest": "6.3.4"