fix: server/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-WS-17988732

server/package.json

@@ -77,7 +77,7 @@
     "pino-pretty": "^13.1.3",
     "sharp": "^0.35.3",
     "ssh2": "^1.17.0",
-    "ws": "^8.19.0",
+    "ws": "^8.21.1",
     "zod": "^3.24.2"
   },
   "devDependencies": {