Editor: Update packages for 6.8.2 RC1.

This changeset syncs packages from Gutenberg ahead of 6.8.2 RC1.

Props mamaduka, wildworks.
See #63582.



git-svn-id: https://develop.svn.wordpress.org/trunk@60438 602fd350-edb4-49c9-b593-d223f7449a82

Author: audrasjb