Some buildbot scripts and tools rely on MarkUpSafe. We should automatically install it with our other buildbot libraries. Note that webkitscmpy already depends on MarkUpSafe, so rather than re-define the version of the library we want, we can just rely on webkitscmpy's version.
<rdar://problem/109737468>
Pull request: https://github.com/WebKit/WebKit/pull/14266
Committed 264440@main (8bef1d982bc6): <https://commits.webkit.org/264440@main> Reviewed commits have been landed. Closing PR #14266 and removing active labels.