Bump @webref/css from 7.1.4 to 8.0.0

Bumps [@webref/css](https://github.com/w3c/webref) from 7.1.4 to 8.0.0.
- [Commits](https://github.com/w3c/webref/compare/@webref/[email protected]...@webref/[email protected])

---
updated-dependencies:
- dependency-name: "@webref/css"
  dependency-version: 8.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -97,7 +97,7 @@
     "@types/superagent": "^8.1.9",
     "@types/webidl2": "^24.4.3",
     "@types/yargs": "^17.0.33",
-    "@webref/css": "7.1.4",
+    "@webref/css": "8.0.0",
     "@webref/elements": "^2.5.1",
     "@webref/idl": "3.68.3",
     "c8": "10.1.3",