chore: update @webref/css to ^8.5.6 (#451)

fix: update baseline data

Co-authored-by: fasttime <6367844+fasttime@users.noreply.github.com>

Author: eslintbot

package.json

@@ -80,7 +80,7 @@
     "@arethetypeswrong/cli": "^0.18.2",
     "@eslint/json": "^1.2.0",
     "@types/node": "^20.19.0",
-    "@webref/css": "^8.5.5",
+    "@webref/css": "^8.5.6",
     "c8": "^11.0.0",
     "dedent": "^1.5.3",
     "eslint": "^10.0.0",