Bump cssnano from 5.1.8 to 5.1.9

Bumps [cssnano](https://github.com/cssnano/cssnano) from 5.1.8 to 5.1.9.
- [Release notes](https://github.com/cssnano/cssnano/releases)
- [Commits](https://github.com/cssnano/cssnano/compare/cssnano@5.1.8...cssnano@5.1.9)

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

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

Author: dependabot[bot]

package-lock.json

@@ -10,7 +10,7 @@
   },
   "devDependencies": {
     "autoprefixer": "^10.4.7",
-    "cssnano": "^5.1.8",
+    "cssnano": "^5.1.9",
     "npm-run-all": "^4.1.5",
     "postcss": "^8.4.14",
     "postcss-cli": "^9.1.0",