Bump express from 4.18.2 to 4.19.2 in /webapp/backend

Bumps [express](https://github.com/expressjs/express) from 4.18.2 to 4.19.2.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@4.18.2...4.19.2)

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

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

Author: dependabot[bot]

webapp/backend/package-lock.json

@@ -45,7 +45,7 @@
     "ajv": "^8.12.0",
     "body-parser": "^1.20.2",
     "cors": "^2.8.5",
-    "express": "^4.18.2",
+    "express": "^4.19.2",
     "jsonfile": "^6.1.0",
     "typescript-json-schema": "^0.59.0"
   }