Bump cssnano from 5.1.12 to 5.1.13

Bumps [cssnano](https://github.com/cssnano/cssnano) from 5.1.12 to 5.1.13.
- [Release notes](https://github.com/cssnano/cssnano/releases)
- [Commits](https://github.com/cssnano/cssnano/compare/cssnano@5.1.12...cssnano@5.1.13)

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

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

package.json

@@ -16,7 +16,7 @@
         "browserlist": "^1.0.1",
         "compression-webpack-plugin": "^10.0.0",
         "css-loader": "^6.2.0",
-        "cssnano": "^5.1.12",
+        "cssnano": "^5.1.13",
         "eslint": "^8.22.0",
         "eslint-webpack-plugin": "^3.2.0",
         "mini-css-extract-plugin": "^2.6.1",