REST API: Remove unused variable from the permissions check for deleting a revision.

`WP_REST_Revisions_Controller::delete_item_permissions_check()` no longer uses the value of the `$parent_post_type` variable anywhere. 

Follow-up to [45812], [47547], [47850].

Props Soean, mukesh27.
Fixes #58218.
Built from https://develop.svn.wordpress.org/trunk@55696


git-svn-id: http://core.svn.wordpress.org/trunk@55208 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php

@@ -410,8 +410,6 @@ class WP_REST_Revisions_Controller extends WP_REST_Controller {
 			return $parent;
 		}
 
-		$parent_post_type = get_post_type_object( $parent->post_type );
-
 		if ( ! current_user_can( 'delete_post', $parent->ID ) ) {
 			return new WP_Error(
 				'rest_cannot_delete',

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.3-alpha-55695';
+$wp_version = '6.3-alpha-55696';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.