Bump ws from 7.2.1 to 7.4.6 in /test-ws-server

Bumps [ws](https://github.com/websockets/ws) from 7.2.1 to 7.4.6.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@7.2.1...7.4.6)

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

Author: dependabot[bot]

test-ws-server/package.json

@@ -11,6 +11,6 @@
   "dependencies": {
     "express": "^4.17.1",
     "open": "^7.0.0",
-    "ws": "^7.2.1"
+    "ws": "^7.4.6"
   }
 }