Bump webpack-merge in /{{cookiecutter.project_slug}}

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] <[email protected]>

{{cookiecutter.project_slug}}/package.json

@@ -32,7 +32,7 @@
     "webpack-bundle-tracker": "^3.0.1",
     "webpack-cli": "^5.0.1",
     "webpack-dev-server": "^5.0.2",
-    "webpack-merge": "^5.8.0"
+    "webpack-merge": "^6.0.1"
   },
   "engines": {
     "node": "20"