Script Loader: Use defer loading strategy for wp-embed script and move to head (in block themes).

Props westonruter, flixos90, swissspidy.
Fixes #58931.

Built from https://develop.svn.wordpress.org/trunk@56355


git-svn-id: http://core.svn.wordpress.org/trunk@55867 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/script-loader.php

@@ -1349,7 +1349,8 @@ function wp_default_scripts( $scripts ) {
 		)
 	);
 
-	$scripts->add( 'wp-embed', "/wp-includes/js/wp-embed$suffix.js", array(), false, 1 );
+	$scripts->add( 'wp-embed', "/wp-includes/js/wp-embed$suffix.js" );
+	did_action( 'init' ) && $scripts->add_data( 'wp-embed', 'strategy', 'defer' );
 
 	/*
 	 * To enqueue media-views or media-editor, call wp_enqueue_media().

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.4-alpha-56354';
+$wp_version = '6.4-alpha-56355';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.