LICENSE does not contain references to the W3C test suite license #2762

The LICENSE file at test/selectors/LICENSE references https://github.com/web-platform-tests/wpt/tree/96c61ac7c21f7f37526d1c03c4c6087734524130/selectors-api .

The LICENSE file of web-platform-tests at that commit, LICENSE, refers to http://www.w3.org/Consortium/Legal/2008/04-testsuite-copyright.html, which refers to W3C test suite license - 2023 version

I think that the LICENSE file at the root of this package needs to contain all of the licenses that apply to the package, including the full text of that W3C test suite license.