Bundled Themes: Make Twenty Twenty-One the default theme.

After being imported in [49216], Twenty Twenty-One can now be set as the default theme in WordPress.

See #48110.
Built from https://develop.svn.wordpress.org/trunk@49220


git-svn-id: http://core.svn.wordpress.org/trunk@48982 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-theme.php

@@ -59,6 +59,7 @@ final class WP_Theme implements ArrayAccess {
 		'twentyseventeen' => 'Twenty Seventeen',
 		'twentynineteen'  => 'Twenty Nineteen',
 		'twentytwenty'    => 'Twenty Twenty',
+		'twentytwentyone' => 'Twenty Twenty-One',
 	);
 
 	/**

wp-includes/default-constants.php

@@ -409,7 +409,7 @@ function wp_templating_constants() {
 	 * @see WP_Theme::get_core_default_theme()
 	 */
 	if ( ! defined( 'WP_DEFAULT_THEME' ) ) {
-		define( 'WP_DEFAULT_THEME', 'twentytwenty' );
+		define( 'WP_DEFAULT_THEME', 'twentytwentyone' );
 	}
 
 }

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-alpha-49219';
+$wp_version = '5.6-alpha-49220';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.