NPM Dev(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-version: 6.0.1
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -18,7 +18,7 @@
         "cypress": "^13.6.1",
         "cypress-axe": "^1.5.0",
         "node-fetch": "^3.3.2",
-        "webpack-merge": "^5.8.0"
+        "webpack-merge": "^6.0.1"
     },
     "scripts": {
         "build": "wp-scripts build ./src/onboarding.js ./src/Scripts/sitegen-theme-marker/sitegen-theme-marker.js ./src/Scripts/sitegen-theme-marker/sitegen-theme-marker.css  ./src/Scripts/onboarding-restart-button/onboarding-restart-button.js ./src/Scripts/onboarding-restart-button/onboarding-restart-button.css",