⬆️ Bump @types/ws from 6.0.4 to 7.4.6 (#11)

Bumps [@types/ws](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/ws) from 6.0.4 to 7.4.6.
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Author: dependabot[bot]

package.json

@@ -113,7 +113,7 @@
     "@types/react-beautiful-dnd": "^11.0.3",
     "@types/react-dom": "^16.9.4",
     "@types/universal-analytics": "^0.4.3",
-    "@types/ws": "^6.0.4",
+    "@types/ws": "^7.4.6",
     "@typescript-eslint/eslint-plugin": "^2.12.0",
     "@typescript-eslint/parser": "^2.12.0",
     "add-asset-webpack-plugin": "^1.0.0",