fix: backend/package.json & backend/package-lock.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-QS-14724253

Author: snyk-bot

backend/package-lock.json

@@ -12,7 +12,7 @@
   "author": "",
   "license": "UNLICENSED",
   "dependencies": {
-    "express": "^4.18.1",
+    "express": "^4.22.0",
     "mkdirp": "^1.0.4",
     "nodemon": "^2.0.17",
     "prom-client": "^12.0.0",