Update wpt css/css-color to upstream commit: https://github.com/web-platform-tests/wpt/commit/fd6e317871ed6baeedfe25b03b79b73eb898d15c
<rdar://problem/127235481>
Pull request: https://github.com/WebKit/WebKit/pull/27874
Committed 278129@main (8faca0da76fd): <https://commits.webkit.org/278129@main> Reviewed commits have been landed. Closing PR #27874 and removing active labels.