build(deps-dev): bump webpack-merge from 5.8.0 to 5.9.0 (#52)

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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -21,7 +21,7 @@
     "css-loader": "^6.7.4",
     "webpack": "^5.83.1",
     "webpack-cli": "^5.1.1",
-    "webpack-merge": "^5.8.0"
+    "webpack-merge": "^5.9.0"
   },
   "dependencies": {
     "shepherd.js": "^11.1.1"