Following the changes in Bug 249414 and Bug 271383, complete the work of moving to std::span in CryptoDigest-related code.
<rdar://problem/125256518>
Pull Request: https://github.com/WebKit/WebKit/pull/26337
Committed 276673@main (779251105768): <https://commits.webkit.org/276673@main> Reviewed commits have been landed. Closing PR #26337 and removing active labels.