remove unused deps

packages/flutter_mozilla_components/javascript/container_proxy/package.json

@@ -37,14 +37,9 @@
     "addons-linter": "^7.8.0",
     "chai": "^5.1.2",
     "copy-webpack-plugin": "^12.0.2",
-    "css-loader": "^7.1.2",
-    "css-modules-typescript-loader": "^4.0.1",
-    "esm": "^3.2.25",
     "mocha": "^10.8.2",
-    "sass-loader": "^16.0.4",
     "sinon": "^8.1.1",
     "standardx": "^7.0.0",
-    "style-loader": "^4.0.0",
     "ts-loader": "^9.2.6",
     "ts-mocha": "^10.0.0",
     "ts-standard": "^12.0.2",