Editor: Update packages for WordPress 5.6 RC2.

The following package versions were changed:

@wordpress/block-directory: 1.17.4 -> 1.17.5
@wordpress/block-editor: 5.1.3 -> 5.1.4
@wordpress/block-library: 2.26.4 -> 2.26.5
@wordpress/blocks: 6.24.1 -> 6.24.2
@wordpress/components: 11.1.1 -> 11.1.2
@wordpress/core-data: 2.24.1 -> 2.24.2
@wordpress/edit-post: 3.25.4 -> 3.25.5
@wordpress/editor: 9.24.3 -> 9.24.4
@wordpress/format-library: 1.25.3 -> 1.25.4
@wordpress/list-reusable-blocks: 1.24.1 -> 1.24.2
@wordpress/nux: 3.23.1 -> 3.23.2
@wordpress/reusable-blocks: 1.0.3 -> 1.0.4
@wordpress/server-side-render: 1.19.1 -> 1.19.2

See WordPress/gutenberg#27366 for the list of fixed bugs.

Props isabel_brison.
Fixes #51902.

git-svn-id: https://develop.svn.wordpress.org/trunk@49718 602fd350-edb4-49c9-b593-d223f7449a82