Editor: Expand Block Bindings for button block.

Add block bindings support for the linkTarget and rel button block attributes.
This allows using custom fiends or pattern overrides for these attributes.

Props glendaviesnz.
Fixes #60481.
Built from https://develop.svn.wordpress.org/trunk@57576


git-svn-id: http://core.svn.wordpress.org/trunk@57077 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-block.php

@@ -241,7 +241,7 @@ class WP_Block {
 			'core/paragraph' => array( 'content' ),
 			'core/heading'   => array( 'content' ),
 			'core/image'     => array( 'url', 'title', 'alt' ),
-			'core/button'    => array( 'url', 'text' ),
+			'core/button'    => array( 'url', 'text', 'linkTarget', 'rel' ),
 		);
 
 		// If the block doesn't have the bindings property, isn't one of the allowed

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.5-alpha-57575';
+$wp_version = '6.5-alpha-57576';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.