Bump elliptic from 6.5.4 to 6.6.0 in /frontend

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.5.4 to 6.6.0.
- [Commits](https://github.com/indutny/elliptic/compare/v6.5.4...v6.6.0)

---
updated-dependencies:
- dependency-name: elliptic
  dependency-type: indirect
...

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frontend/package.json

@@ -9,7 +9,7 @@
     "react": "^17.0.2",
     "react-dom": "^17.0.2",
     "react-json-view": "^1.21.3",
-    "react-scripts": "5.0.1",
+    "react-scripts": "4.0.3",
     "web-vitals": "^1.0.1"
   },
   "proxy": "http://localhost:8080",