Update npm packages to latest versions for 6.4

[mikachan]

Trac ticket: https://core.trac.wordpress.org/ticket/59411

Included changes:

• Pattern: fix regression error in post type templates gutenberg#55858
• Fix lightbox trigger styles gutenberg#55859

New published packages for this update: WordPress/gutenberg@8447c60

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This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

[hellofromtonya]

Test Report

Steps to Reproduce

Followed the test instructions found in the GB issue WordPress/gutenberg#55846.

1. Created a wp-includes/mu-plugins/ directory.
2. Created a new test.php file in that directory.
3. Added the following code to that file:

<?php

add_action( 'init', function() {
	register_post_type(
		'my-test',
		array(
			'public'       => true,
			'show_in_rest' => true,
			'template'     => array(
				array(
					'core/pattern',
					array( 'slug' => 'core/simple-header-with-dark-background' ),
				),
			),
			'labels'                => array(
				'name'          => 'My Test',
				'singular_name' => 'My Test',
			),
		)
	);
} );

4. Using WordPress 6.3.2, launched and logged into my local testing site.
5. Navigated to "My Test" > "Add New Post". (No error)
6. Added a title: "Pattern as Template".
7. Published.
8. Upgraded to WordPress 6.4 RC3 using wp core update --version=6.4-RC3.
9. Refreshed the "Pattern as Template" screen. (No error)
10. Navigated back to the "My Test" UI.
11. Added a "my-test" post.
12. 🐞 Bug occurs when the editor opens, when creating a new post for a custom post type.

Results with reproducing the regression

With 6.3.2:

• ✅ When creating a new post for a custom post type: pattern renders without issue (no error).
• ✅ When opening an existing post (for a custom post type): pattern renders without issue (no error).
• ✅ In the frontend, an existing and new post both render correctly (no error).

With 6.4 RC3 and the current 6.4 branch and with TT3 or TT4 theme and no activated plugins:

• ❌ 🐞 When creating a new post for a custom post type: pattern cannot be previewed and a console error is raised.

This block has encountered an error and cannot be previewed.

Uncaught TypeError: select(...).getCurrentTheme() is undefined

• ✅ When opening an existing post (for a custom post type): pattern renders without issue (no error).
• In the frontend:
  • ❌ 🐞 the newly added "my-test" post's pattern does not render.
  • ✅ the existing "my-test" post pattern does render.

Test Report Icons:
🐞 <= Indicates where issue ("bug") occurs.
✅ <= Behavior is ''expected''.
❌ <= Behavior is ''NOT expected''.

Observations

This regression only affects:

• New posts for any custom post type that sets its "template" as a pattern.
• The pattern within that new post(s) in the editor and frontend.

Other blocks within a new post do not seem to be affected.

[hellofromtonya]

For the pattern as template regression: this PR resolves the issue ✅

[hellofromtonya]

In my testing:

• can reproduce the reported issue.
• confirm this PR resolves it.

Changes the LGTM. Ready for commit 👍

[hellofromtonya]

Committed to trunk via https://core.trac.wordpress.org/changeset/57063.