Bump express from 4.20.0 to 4.21.0

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] <[email protected]>

package.json

@@ -16,7 +16,7 @@
         "cookie-session": "^2.1.0",
         "dotenv": "^16.4.5",
         "ejs": "^3.1.10",
-        "express": "^4.20.0",
+        "express": "^4.21.0",
         "fs-extra": "^11.2.0",
         "jsonwebtoken": "^9.0.2",
         "mysql2": "^3.11.3",