Bump express from 4.21.2 to 4.22.0 in /backend

Bumps [express](https://github.com/expressjs/express) from 4.21.2 to 4.22.0.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/4.22.0/History.md)
- [Commits](expressjs/express@4.21.2...4.22.0)

---
updated-dependencies:
- dependency-name: express
  dependency-version: 4.22.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

backend/package.json

@@ -19,7 +19,7 @@
 		"bcrypt": "^5.0.0",
 		"body-parser": "^1.20.3",
 		"compression": "^1.7.4",
-		"express": "^4.20.0",
+		"express": "^4.22.0",
 		"express-fileupload": "^1.5.2",
 		"gravatar": "^1.8.2",
 		"jsonwebtoken": "^9.0.2",