Add css-fonts-5 to CSSProperties categories so it can be used by properties implemented in that level.
<rdar://problem/108362775>
Pull request: https://github.com/WebKit/WebKit/pull/13021
Committed 263238@main (15c23ee11931): <https://commits.webkit.org/263238@main> Reviewed commits have been landed. Closing PR #13021 and removing active labels.