Bump webpack-merge from 5.8.0 to 5.9.0

Bumps [webpack-merge](https://github.com/survivejs/webpack-merge) from 5.8.0 to 5.9.0.
- [Changelog](https://github.com/survivejs/webpack-merge/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/survivejs/webpack-merge/commits)

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

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

package.json

@@ -153,7 +153,7 @@
     "typescript": "4.8.2",
     "wait-on": "6.0.1",
     "webpack-bundle-analyzer": "4.6.1",
-    "webpack-merge": "5.8.0",
+    "webpack-merge": "5.9.0",
     "webpack-notifier": "1.15.0"
   },
   "engines": {