chore: remove unused dependencies

Author: ghiscoding

bootstrap5-i18n-demo/package.json

@@ -62,17 +62,14 @@
     "@types/sortablejs": "^1.15.8",
     "@types/text-encoding-utf-8": "^1.0.5",
     "@vitejs/plugin-react": "^4.6.0",
-    "copyfiles": "^2.4.1",
     "cross-env": "^7.0.3",
-    "custom-event-polyfill": "^1.0.7",
     "eslint": "^9.31.0",
     "eslint-plugin-import": "^2.32.0",
     "eslint-plugin-n": "^17.21.0",
     "eslint-plugin-prefer-arrow": "^1.2.3",
     "eslint-plugin-react": "^7.37.5",
     "eslint-plugin-react-hooks": "^5.2.0",
     "globals": "^16.3.0",
-    "isomorphic-fetch": "^3.0.0",
     "react-router-dom": "^7.6.3",
     "rxjs": "^7.8.2",
     "sass": "^1.89.2",