Build(deps): Bump ws in /Predictor/PredictorWebService

Bumps [ws](https://github.com/websockets/ws) from 6.2.1 to 7.4.6.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](https://github.com/websockets/ws/compare/6.2.1...7.4.6)

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

Predictor/PredictorWebService/package.json

@@ -12,7 +12,7 @@
     "mongoose": "^5.7.7",
     "nodemon": "^1.18.10",
     "query-string-parser": "^0.2.3",
-    "ws": "^6.2.1"
+    "ws": "^7.4.6"
   },
   "devDependencies": {
     "@types/node": "^11.13.0",