fix: upgrade terser-webpack-plugin from 5.3.6 to 5.3.9

Snyk has created this PR to upgrade terser-webpack-plugin from 5.3.6 to 5.3.9.

See this package in npm:
https://www.npmjs.com/package/terser-webpack-plugin

See this project in Snyk:
https://app.snyk.io/org/woodpile37/project/044862aa-1005-4f2f-af06-341513c0e0a2?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

frontend/package.json

@@ -44,7 +44,7 @@
     "prettier": "3.0.0",
     "sass-loader": "^13.1.0",
     "standard": "^17.0.0",
-    "terser-webpack-plugin": "^5.3.6",
+    "terser-webpack-plugin": "^5.3.9",
     "webpack": "^5.76.0",
     "webpack-cli": "^5.0.1",
     "webpack-dev-server": "^4.15.1",