build(deps-dev): Bump sass-loader from 8.0.2 to 9.0.1 in /frontend

Bumps [sass-loader](https://github.com/webpack-contrib/sass-loader) from 8.0.2 to 9.0.1.
- [Release notes](https://github.com/webpack-contrib/sass-loader/releases)
- [Changelog](https://github.com/webpack-contrib/sass-loader/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/sass-loader@v8.0.2...v9.0.1)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

frontend/package.json

@@ -42,7 +42,7 @@
     "node-sass": "^4.12.0",
     "optimize-css-assets-webpack-plugin": "^5.0.3",
     "prettier": "1.19.1",
-    "sass-loader": "^8.0.0",
+    "sass-loader": "^9.0.1",
     "standard": "^14.1.0",
     "terser-webpack-plugin": "^3.0.0",
     "webpack": "^4.40.2",