Block Editor: Update WordPress Packages WordPress 5.4 RC 4.

The following package versions were changed:
@wordpress/annotations: 1.12.1 -> 1.12.2
@wordpress/block-directory: 1.5.5 -> 1.5.6
@wordpress/block-editor: 3.7.5 -> 3.7.6
@wordpress/block-library: 2.14.5 -> 2.14.6
@wordpress/blocks: 6.12.1 -> 6.12.2
@wordpress/components: 9.2.4 -> 9.2.5
@wordpress/core-data: 2.12.1 -> 2.12.2
@wordpress/data: 4.14.1 -> 4.14.2
@wordpress/data-controls: 1.8.1 -> 1.8.2
@wordpress/edit-post: 3.13.6 -> 3.13.7
@wordpress/editor: 9.12.5 -> 9.12.6
@wordpress/format-library: 1.14.5 -> 1.14.6
@wordpress/keyboard-shortcuts: 1.1.1 -> 1.1.2
@wordpress/list-reusable-blocks: 1.13.4 -> 1.13.5
@wordpress/notices: 2.0.1 -> 2.0.2
@wordpress/nux: 3.12.4 -> 3.12.5
@wordpress/rich-text: 3.12.1 -> 3.12.2
@wordpress/server-side-render: 1.8.4 -> 1.8.5
@wordpress/viewport: 2.13.1 -> 2.13.2
Description of editor changes included in the RC available at WordPress/gutenberg#21083.

Props itsjonq, mcsf, aduth.
Fixes: #49688.

git-svn-id: https://develop.svn.wordpress.org/trunk@47495 602fd350-edb4-49c9-b593-d223f7449a82