Follow-up for #51491.
Updating WordPress packages is currently a manual process that takes some reading and trial & error to figure out. This PR adds a single npm task called `sync-gutenberg-packages` that automates this entire process.
Props zieladam.
Fixes#55642.
git-svn-id: https://develop.svn.wordpress.org/trunk@53311 602fd350-edb4-49c9-b593-d223f7449a82
