Bump clean-css from 5.3.2 to 5.3.3

Bumps [clean-css](https://github.com/clean-css/clean-css) from 5.3.2 to 5.3.3.
- [Changelog](https://github.com/clean-css/clean-css/blob/master/History.md)
- [Commits](clean-css/clean-css@v5.3.2...v5.3.3)

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

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

package.json

@@ -40,7 +40,7 @@
     "@11ty/eleventy": "^2.0.1",
     "@11ty/eleventy-plugin-syntaxhighlight": "^5.0.0",
     "all-contributors-cli": "^6.26.1",
-    "clean-css": "^5.3.2",
+    "clean-css": "^5.3.3",
     "html-minifier": "^4.0.0",
     "luxon": "^3.4.4",
     "markdown-it": "^13.0.2",