Block Editor: Update WordPress Packages WordPress 5.4 RC 5.

The following package versions were changed:
@wordpress/annotations: 1.12.2 -> 1.12.3
@wordpress/block-directory: 1.5.6 -> 1.5.7
@wordpress/block-editor: 3.7.6 -> 3.7.7
@wordpress/block-library: 2.14.6 -> 2.14.7
@wordpress/blocks: 6.12.2 -> 6.12.3
@wordpress/components: 9.2.5 -> 9.2.6
@wordpress/core-data: 2.12.2 -> 2.12.3
@wordpress/edit-post: 3.13.7 -> 3.13.8
@wordpress/editor: 9.12.6 -> 9.12.7
@wordpress/format-library: 1.14.6 -> 1.14.7
@wordpress/list-reusable-blocks: 1.13.5 -> 1.13.6
@wordpress/nux: 3.12.5 -> 3.12.6
@wordpress/server-side-render: 1.8.5 -> 1.8.6
Description of editor changes included in the RC available at WordPress/gutenberg#21210.

Props mcsf, aduth.
Merges [47513] to the 5.4 branch.
Fixes: #49716.

git-svn-id: https://develop.svn.wordpress.org/branches/5.4@47514 602fd350-edb4-49c9-b593-d223f7449a82