build(deps-dev): bump grunt-webpack from 5.0.0 to 6.0.0 (#578)

Bumps [grunt-webpack](https://github.com/webpack-contrib/grunt-webpack) from 5.0.0 to 6.0.0.
- [Release notes](https://github.com/webpack-contrib/grunt-webpack/releases)
- [Commits](webpack-contrib/grunt-webpack@v5.0.0...v6.0.0)

---
updated-dependencies:
- dependency-name: grunt-webpack
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -63,7 +63,7 @@
     "grunt-contrib-connect": "^4.0.0",
     "grunt-contrib-watch": "^1.1.0",
     "grunt-saucelabs": "^9.0.0",
-    "grunt-webpack": "^5.0.0",
+    "grunt-webpack": "^6.0.0",
     "intersection-observer": "^0.12.0",
     "jest": "^29.0.0",
     "jest-environment-jsdom": "^29.0.0",