ui: add overrides for [email protected]

Found via facebook/create-react-app#13130 (comment), this allows us to avoid the security vulnerability warning for react-scripts library by upgrading the transitive css-select => nth-check dependency to >= v2.0.1 for facebook/create-react-app#11174.

Author: hkjn

ui/package-lock.json

@@ -7,6 +7,9 @@
     "react": "^16.14.0",
     "react-dom": "^16.14.0"
   },
+  "overrides": {
+    "nth-check": "2.1.1"
+  },
   "devDependencies": {
     "react-scripts": "^5.0.1"
   },