Add Hunseop Jeong as committer in contributors.json
I want to reactive the committer. I already sent the email to webkit-committers@lists.webkit.org. I'm going to contribute to the accessibility again. I already merged the patch. https://github.com/WebKit/WebKit/pull/15317
Pull request: https://github.com/WebKit/WebKit/pull/17677
Committed 267888@main (1788551dda5a): <https://commits.webkit.org/267888@main> Reviewed commits have been landed. Closing PR #17677 and removing active labels.
<rdar://problem/115324964>