chore(deps-dev): bump cssnano from 6.0.3 to 6.0.4 (#516)

Bumps [cssnano](https://github.com/cssnano/cssnano) from 6.0.3 to 6.0.4.
- [Release notes](https://github.com/cssnano/cssnano/releases)
- [Commits](https://github.com/cssnano/cssnano/compare/cssnano@6.0.3...cssnano@6.0.4)

---
updated-dependencies:
- dependency-name: cssnano
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -45,7 +45,7 @@
     "@fullhuman/postcss-purgecss": "5.0.0",
     "autoprefixer": "10.4.17",
     "charts.css": "1.1.0",
-    "cssnano": "6.0.3",
+    "cssnano": "6.0.4",
     "cz-git": "^1.8.0",
     "postcss": "8.4.35",
     "postcss-cli": "11.0.0",