Posts, Post Types: Remove now obsolete hardcoded `attachment` check for autosave support.

Follow-up to [58201].

Props swissspidy, spacedmonkey.
See #41172.
Built from https://develop.svn.wordpress.org/trunk@58211


git-svn-id: http://core.svn.wordpress.org/trunk@57674 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-post-type.php

@@ -937,10 +937,6 @@ final class WP_Post_Type {
 			return null;
 		}
 
-		if ( 'attachment' === $this->name ) {
-			return null;
-		}
-
 		$class = $this->autosave_rest_controller_class ? $this->autosave_rest_controller_class : WP_REST_Autosaves_Controller::class;
 
 		if ( ! class_exists( $class ) ) {

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.6-alpha-58210';
+$wp_version = '6.6-alpha-58211';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.