Build(deps-dev): Bump webpack-merge from 5.10.0 to 6.0.1

Bumps [webpack-merge](https://github.com/survivejs/webpack-merge) from 5.10.0 to 6.0.1.
- [Changelog](https://github.com/survivejs/webpack-merge/blob/develop/CHANGELOG.md)
- [Commits](survivejs/webpack-merge@v5.10.0...v6.0.1)

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

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

package.json

@@ -31,7 +31,7 @@
     "style-loader": "^3.3.4",
     "webpack": "^5.93.0",
     "webpack-cli": "^5.1.4",
-    "webpack-merge": "^5.10.0"
+    "webpack-merge": "^6.0.1"
   },
   "dependencies": {
     "@nextcloud/router": "^2.2.1",