Upgrade/Install: Update the $_old_files array for 6.8.

git-svn-id: https://develop.svn.wordpress.org/trunk@60160 602fd350-edb4-49c9-b593-d223f7449a82

Author: audrasjb

src/wp-admin/includes/update-core.php

@@ -828,6 +828,19 @@
 	'wp-includes/SimplePie/Net/',
 	'wp-includes/SimplePie/Parse/',
 	'wp-includes/SimplePie/XML/',
+	// 6.8
+	'wp-includes/blocks/post-content/editor.css',
+	'wp-includes/blocks/post-content/editor.min.css',
+	'wp-includes/blocks/post-content/editor-rtl.css',
+	'wp-includes/blocks/post-content/editor-rtl.min.css',
+	'wp-includes/blocks/post-template/editor.css',
+	'wp-includes/blocks/post-template/editor.min.css',
+	'wp-includes/blocks/post-template/editor-rtl.css',
+	'wp-includes/blocks/post-template/editor-rtl.min.css',
+	'wp-includes/js/dist/undo-manager.js',
+	'wp-includes/js/dist/undo-manager.min.js',
+	'wp-includes/js/dist/fields.min.js',
+	'wp-includes/js/dist/fields.js',
 );
 
 /**