It is part of the sync from the Gutenberg plugin that introduces the registry for block binding sources required for the new Block Bindings API: WordPress/gutenberg#54536.
See #60282.
Follow-up [57373].
Props czapla, artemiosans, santosguillamot, sc0ttkclark, lgladdy, talldanwp, swissspidy, youknowriad, fabiankaegy, mukesh27.
Built from https://develop.svn.wordpress.org/trunk@57375
git-svn-id: http://core.svn.wordpress.org/trunk@56881 1a063a9b-81f0-0310-95a4-ce76da25c4cd
