Bump express from 4.19.2 to 4.21.2

Bumps [express](https://github.com/expressjs/express) from 4.19.2 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@4.19.2...4.21.2)

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

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

package.json

@@ -60,7 +60,7 @@
     "crypto-random-string": "5.0.0",
     "csrf-sync": "4.0.3",
     "css-loader": "7.1.2",
-    "express": "4.19.2",
+    "express": "4.21.2",
     "express-promise-router": "4.1.1",
     "express-session": "1.18.0",
     "handlebars": "4.7.7",