Bump ws from 8.7.0 to 8.8.1 in /backend

Bumps [ws](https://github.com/websockets/ws) from 8.7.0 to 8.8.1.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@8.7.0...8.8.1)

---
updated-dependencies:
- dependency-name: ws
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

backend/package-lock.json

@@ -37,7 +37,7 @@
     "node-worker-threads-pool": "^1.5.1",
     "socks-proxy-agent": "^6.2.0",
     "typescript": "~4.7.2",
-    "ws": "~8.7.0"
+    "ws": "~8.8.1"
   },
   "devDependencies": {
     "@types/compression": "^1.7.2",