Bump path-to-regexp and express in /backend

Bumps [path-to-regexp](https://github.com/pillarjs/path-to-regexp) to 0.1.13 and updates ancestor dependency [express](https://github.com/expressjs/express). These dependencies need to be updated together.


Updates `path-to-regexp` from 0.1.12 to 0.1.13
- [Release notes](https://github.com/pillarjs/path-to-regexp/releases)
- [Changelog](https://github.com/pillarjs/path-to-regexp/blob/v.0.1.13/History.md)
- [Commits](pillarjs/path-to-regexp@v0.1.12...v.0.1.13)

Updates `express` from 4.21.2 to 4.22.1
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/v4.22.1/History.md)
- [Commits](expressjs/express@4.21.2...v4.22.1)

---
updated-dependencies:
- dependency-name: path-to-regexp
  dependency-version: 0.1.13
  dependency-type: indirect
- dependency-name: express
  dependency-version: 4.22.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

backend/package-lock.json

@@ -9,7 +9,7 @@
     "test": "node test.js"
   },
   "dependencies": {
-    "express": "^4.18.2",
+    "express": "^4.22.1",
     "nanoid": "^3.3.7",
     "qrcode": "^1.5.3",
     "cors": "^2.8.5"