build(deps-dev): Bump webpack in /build/frontend-legacy

Bumps [webpack](https://github.com/webpack/webpack) from 5.103.0 to 5.104.1.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Changelog](https://github.com/webpack/webpack/blob/main/CHANGELOG.md)
- [Commits](webpack/webpack@v5.103.0...v5.104.1)

---
updated-dependencies:
- dependency-name: webpack
  dependency-version: 5.104.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

build/frontend-legacy/package-lock.json

@@ -132,7 +132,7 @@
     "vitest": "^4.0.13",
     "vue-loader": "^15.11.1",
     "vue-template-compiler": "^2.7.16",
-    "webpack": "^5.103.0",
+    "webpack": "^5.104.1",
     "webpack-cli": "^6.0.1",
     "webpack-merge": "^6.0.1",
     "workbox-webpack-plugin": "^7.4.0"