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:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -52,7 +52,7 @@
     "webpack": "^5.83.1",
     "webpack-assets-manifest": "^5.1.0",
     "webpack-cli": "^5.1.0",
-    "webpack-merge": "^5.8.0",
+    "webpack-merge": "^5.9.0",
     "webpack-sources": "^3.2.3",
     "webpack-subresource-integrity": "^5.1.0",
     "xss": "^1.0.14"