cjk-earthly-branch and cjk-heavenly-stem should fallback to cjk-decimal per CSSWG resolution: https://github.com/w3c/csswg-drafts/issues/8975
<rdar://problem/111208503>
Pull request: https://github.com/WebKit/WebKit/pull/15234
Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/40720
Committed 265474@main (e01c725885a7): <https://commits.webkit.org/265474@main> Reviewed commits have been landed. Closing PR #15234 and removing active labels.