Bump express from 4.19.2 to 4.21.2 in /api

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
...

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

Author: dependabot[bot]

api/package-lock.json

@@ -42,7 +42,7 @@
     "@httptoolkit/util": "^0.1.5",
     "@sentry/node": "^8.40.0",
     "auth0": "^4.3.1",
-    "express": "^4.18.2",
+    "express": "^4.21.2",
     "express-rate-limit": "^7.4.1",
     "ipaddr.js": "^2.1.0",
     "jsonwebtoken": "^9.0.2",