build(deps-dev): bump terser-webpack-plugin in /frontend

Bumps [terser-webpack-plugin](https://github.com/webpack-contrib/terser-webpack-plugin) from 4.2.3 to 5.1.1.
- [Release notes](https://github.com/webpack-contrib/terser-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/terser-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/terser-webpack-plugin@v4.2.3...v5.1.1)

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -44,7 +44,7 @@
     "prettier": "1.19.1",
     "sass-loader": "^10.1.1",
     "standard": "^16.0.1",
-    "terser-webpack-plugin": "^4.1.0",
+    "terser-webpack-plugin": "^5.1.1",
     "webpack": "^5.25.0",
     "webpack-cli": "^4.5.0",
     "webpack-dev-server": "^3.11.2",