Bump @webref/css from 6.23.9 to 7.0.11

Bumps [@webref/css](https://github.com/w3c/webref) from 6.23.9 to 7.0.11.
- [Commits](https://github.com/w3c/webref/compare/@webref/css6@6.23.9...@webref/css@7.0.11)

---
updated-dependencies:
- dependency-name: "@webref/css"
  dependency-version: 7.0.11
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

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": "6.23.9",
+    "@webref/css": "7.0.11",
     "@webref/elements": "^2.5.0",
     "@webref/idl": "3.67.1",
     "c8": "10.1.3",