build(deps-dev): bump webpack-merge from 5.7.3 to 5.8.0 in /frontend (#982)

Bumps [webpack-merge](https://github.com/survivejs/webpack-merge) from 5.7.3 to 5.8.0.
- [Release notes](https://github.com/survivejs/webpack-merge/releases)
- [Changelog](https://github.com/survivejs/webpack-merge/blob/develop/CHANGELOG.md)
- [Commits](survivejs/webpack-merge@v5.7.3...v5.8.0)

---
updated-dependencies:
- dependency-name: webpack-merge
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

frontend/package-lock.json

@@ -48,7 +48,7 @@
     "webpack": "^5.47.0",
     "webpack-cli": "^4.7.0",
     "webpack-dev-server": "^3.11.2",
-    "webpack-merge": "^5.7.3"
+    "webpack-merge": "^5.8.0"
   },
   "dependencies": {
     "chartist": "^0.11.3",