Bump ws from 8.3.0 to 8.6.0 in /backend

Bumps [ws](https://github.com/websockets/ws) from 8.3.0 to 8.6.0.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](https://github.com/websockets/ws/compare/8.3.0...8.6.0)

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

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

backend/package.json

@@ -37,7 +37,7 @@
     "node-worker-threads-pool": "^1.5.1",
     "socks-proxy-agent": "^6.2.0",
     "typescript": "~4.6.3",
-    "ws": "~8.3.0"
+    "ws": "~8.6.0"
   },
   "devDependencies": {
     "@types/compression": "^1.7.2",