chore(deps-dev): bump @vitejs/plugin-vue in /frontend

Bumps [@vitejs/plugin-vue](https://github.com/vitejs/vite-plugin-vue/tree/HEAD/packages/plugin-vue) from 5.2.4 to 6.0.4.
- [Release notes](https://github.com/vitejs/vite-plugin-vue/releases)
- [Changelog](https://github.com/vitejs/vite-plugin-vue/blob/main/packages/plugin-vue/CHANGELOG.md)
- [Commits](https://github.com/vitejs/vite-plugin-vue/commits/plugin-vue@6.0.4/packages/plugin-vue)

---
updated-dependencies:
- dependency-name: "@vitejs/plugin-vue"
  dependency-version: 6.0.4
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

frontend/package.json

@@ -20,7 +20,7 @@
   },
   "devDependencies": {
     "@types/node": "^22.10.2",
-    "@vitejs/plugin-vue": "^5.2.1",
+    "@vitejs/plugin-vue": "^6.0.4",
     "@vue/test-utils": "^2.4.6",
     "autoprefixer": "^10.4.21",
     "happy-dom": "^20.7.0",